GEO2200 Exam 2 (Quizzes 7-13)

24 July 2022
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question
What does a hydrograph display?
answer
Variations in river discharge over time
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In comparing two cross-sections of a river, we can talk about their discharge (Q) as being the product of their depth (D), width (W) and velocity (V). Q = D * W * V. If at the second cross-section, the depth of the river is much deeper, what must also change to keep the discharges equal (by conservation of mass)?
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The river must get narrower and/or the velocity must be reduced (slower) to compensate.
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Of all the special properties of water, the most important for landscape modification by chemical erosion is its _____.
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Polarity, which allows the water molecule to become attracted to many other different types of molecules and to dissolve them.
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A population of cows is in steady state. The birth rate is 7 calves per year, the death rate is 7 cows per year, and the average residence time for cows on the farm is 4 years. How large is the herd?
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28
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Most of the rain/precipitation that occurs on Earth falls into the oceans.
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True
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According to your knowledge of the effects of urbanization on the natural landscape, which is the hydrograph after urbanization?
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Curve A
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Since the water cycle is balanced, the average annual precipitation worldwide must equal the quantity of water evaporated.
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True
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What is the primary energy source for the Hydrologic Cycle?
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Solar energy
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Identify each of the indicated component parts of the hydrologic cycle by selecting the correct response.
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Energy Source -- m Evaporation -- n Precipitation -- u Evapotranspiration -- p Runoff -- q Groundwater Flow -- r Interception -- t Infiltration -- v
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This cross section shows the location of 5 wells and the water table. Which well is most likely to be an artesian well?
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well E
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What is a possible consequence of overpumping of groundwater?
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along the coast, pulling saltwater into wells that were previously fresh
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The permeability of a material refers to
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the ability of water to flow through a material
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Which of these numbered features contains most of Earth's water?
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1-oceans
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Which of the following can be caused by overpumping of groundwater?
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All of these can be caused by overpumping. (land subsidence, a change in the flow direction, the destruction of an aquifer)
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Of the following choices, the best indicator of drought is
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deficit in water-balance.
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This water balance diagram below suggests that
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long periods of drought are common (picture with a big portion of DEF in dark orange)
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Which of the following is a common setting for a spring?
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a limestone aquifer that intersects the surface
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Which of the following is true about the water table?
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The water table has a similar shape to topography but is more subdued.
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Which of the following energy sources drives the hydrologic cycle?
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solar energy
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Which of the following is true about internal and external processes?
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Tectonics is an internal process and erosion is an external process.
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This diagram shows magnetic stripes on either side of the mid-ocean ridge. How many times did the magnetic field change polarity to form all of the stripes shown here?
answer
five times
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Which of the following is used to match continents or track positions of the continents in the past?
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reconstructions of seafloor spreading, rock types/structures, and magnetism stored in rocks.
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Oceanic crust is MORE DENSE than continental crust.
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True
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Which of the following is NOT the name of a supercontinent?
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Tethys
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In the diagram below, which layer(s) correspond to the mantle?
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3 and 4
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On this map of the South Atlantic, which letter is on a transform fault?
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B
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The hypothesis of continental drift was not widely accepted because
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there was no mechanism to move continents through the oceanic crust.
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Which area(s) on this world map is likely to have volcanoes above sea level?
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just south-west of A (A is in South America)
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Which of the layers in the diagram below are solid or mostly solid?
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All of them. (1, 2, 3, and 4)
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A force that is important in driving plate tectonics is
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All of these. (slab pull., ridge push., upwelling mantle, such as in hot spots.)
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On this map of the south Atlantic, why is the mid-ocean ridge in the center of the ocean?
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Seafloor is added to both sides during seafloor spreading.
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The East African Rift and its neighboring plates are pictured below. What is the main type of geophysical feature in this region?
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Divergent boundary
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The East African Rift and its neighboring plates are pictured below. Comparing locations A, B and C, where would you expect to find the oldest rocks?
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C (above the text "Lake Victoria")
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The below figure shows the dates in megaannum (Ma), or millions of years before present, of a series of volcanic rock in the Yellowstone area. What is the main type of geophysical feature?
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Hotspot
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Using the IRIS Earthquake Browser (http://www.iris.washington.edu/servlet/eventserver/map.do (Links to an external site.)) we've captured a picture of earthquakes in central South America: Notice the pattern of earthquakes. Use the legend key and your knowledge of plate tectonics to figure out what this means. What type of plate boundary is depicted here?
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Convergent
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250 million years ago, the Atlantic Ocean did not even exist yet, because all of the Earth's continents were, at that time, assembled into one large landmass (the super-continent called Pangea).
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True
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The below figure shows the dates in megaannum (Ma), or millions of years before present, of a series of volcanic rock in the Yellowstone area. Relative to the Yellowstone Caldera, what is the movement direction of this plate?
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Northeast to southwest
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If the Atlantic Ocean is widening at a rate of 3 cm per year, how far (in kilometers) will it spread in a million years? Remember to convert your answer from centimeters to kilometers (1 km = 1000 m and 1 m = 100 cm.) NOTE that this is a realistic spreading rate, something on the order of the rate that fingernails grow!
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30 km
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The East African Rift and its neighboring plates are pictured below. What are the relative movement directions of plates A and B in this figure?
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A moves toward the west, B toward the east. (A is above and to the right of "lake Victoria", B is above Lake Turkana)
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The most dangerous type of volcano is a
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composite volcano.
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On this map of southeastern Asia and adjacent areas, which site would have earthquakes along a subduction zone?
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3 and 4 (near Japan and the Tonga Island Arc)
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What type of deformation is shown in this photograph?
What type of deformation is shown in this photograph?
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displacement
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The higher the gas pressure builds in a magma,
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the more explosive an eruptions it is likely to produce.
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Which of the following is NOT evidence of recent activity at a volcano?
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thick, well-developed soil
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Volcanic mudflows (lahars) are common on composite volcanoes because
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large amounts of rain and snowmelt mix with loose ash on steep slopes.
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On this map of southeastern Asia and adjacent areas, which site would have earthquakes along a continental collision?
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2, in Tibet (above India)
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What do the two stars near the center of this block represent?
What do the two stars near the center of this block represent?
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All of these. (the location of the earthquake the star at depth is the place where the earthquake is generated the star at depth is the hypocenter the star on the surface is the epicenter)
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What is the tectonic setting of the large 2011 Tohuku earthquake in Japan?
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slip along a subduction zone (megathrust)
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This photograph from the 1964 Alaskan earthquake shows a white area of seafloor that was uplifted during the event. What does this observation specifically suggest about how the earthquake might cause damage?
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This earthquake could have caused a tsunami because it offset the seafloor. (white on left side darker on right side in image)
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Using the IRIS Earthquake Browser (http://www.iris.washington.edu/servlet/eventserver/map.do) we've captured a picture of earthquakes in central South America: Notice the pattern of earthquakes. Use the legend key and your knowledge of plate tectonics to figure out what this means. Why do we see 'red' earthquakes towards the center of the continent, and 'purple'/'blue' along the coast? Please read your choices carefully! Hint: Use the legend key to figure out what 'red' versus 'purple' earthquakes. Also, determine which type of plate boundary is here.
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The denser oceanic crust is subducting under the less dense continental crust. At the boundary, the earthquakes are shallow (purple/blue), but as the oceanic plate is pushed deeper and away from the boundary, we see deeper earthquake epicenters (red/orange).
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Notice the pattern of earthquakes. Use the legend key and your knowledge of plate tectonics to figure out what this means. What direction (in relation to the continental South American plate) is the oceanic plate (Nazca plate) moving?
answer
East
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Using the IRIS Earthquake Browser (http://www.iris.washington.edu/servlet/eventserver/map.do) we've captured two pictures of southern California earthquakes. The image on the left shows the selected area, and the image on the right shows the depth of the earthquakes. Based upon the images presented, and thinking about the depth of the earthquakes, which of the following statements is true?
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The depth of the earthquakes are all about the same, suggesting this is NOT a convergent boundary.
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Composite volcanoes are so called because they
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are composed of lava flows, pyroclastic material, and mudflows.
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Which of the following factors makes a site near a volcano relatively more dangerous?
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a site that is within a valley that drains the volcano
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Which are true of faults?
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These are all true of faults. (A lateral fault may result from horizontal compression. Orientation of a fault depends on directions of stresses. Vertical compression may result in a more vertically oriented fault.)
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Which of the following is NOT a way that volcanoes and magma can cause earthquakes?
answer
All of these are ways that volcanoes can cause earthquakes. (Volcanic explosions cause seismic waves. Volcanoes can load the crust, causing faulting and earthquakes. Many volcanoes have steep, unstable slopes that can cause landslides that shake the ground. Moving magma within or below the volcano can cause earthquakes.)
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Which of the following are characteristics of actively erupting volcanoes?
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All of these. (Glowing orange lava flowing downhill. Fragments of molten rock blasting into the air. Billowing clouds of ash rising into the air.)
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Where do most earthquakes occur near mid-ocean ridges?
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along the axis of the ridge and on transform faults that connect ridge segments
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Which of the following is a valid statement about how rocks respond to stress?
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If a rock has strained, then it has changed its size or shape.
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In 1999, heavy rains caused debris floods and flash floods that raced through the coastal cities. What should have warned the people of coastal northern Venezuela that they were in a hazardous zone?
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All of these. (the cities were built upon alluvial fans the houses had been built on debris flow deposits the areas above the city had steep unstable slopes)
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What is the main reason why the oceans are salty?
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Weathering of rocks releases chemical elements that make the oceans salty.
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Which sequence of events is required to form a limestone cave where you can walk around and observe cave formations, such as stalactites? (Note: stalactites hang from the ceiling - they have to hold on tight to the roof.)
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limestone is below the water table, then lowering of the water table, then water dripping from the ceiling
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Lichens play a special role in chemical weathering by
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secreting oxalic acid, which dissolves carbonates particularly well.
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The angle of repose is
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the steepest angle at which loose material remains stable.
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Which of the following factors control how minerals weather?
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All of these. (the strength of the chemical bonds in the mineral what type of mineral is present the temperature at which the original minerals formed whether a mineral typically crystallizes early or late in Bowen's Reaction Series)
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Some rocks and minerals are not stable at the surface because they
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All of these. (are exposed to water. formed in high-temperature environments. formed in high-pressure environments. are exposed to oxygen.)
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Which of the following is a way that slopes fail?
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All of these. (large blocks fall from cliffs rocks, soil, sediment, and ice slides down steep hillsides pieces of loose rock accumulate on talus slopes until the angle becomes too steep soil and other loose material can flow rapidly down slopes, forming debris flows)
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All other factors being equal, a slope facing away from the Sun will tend to have
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faster soil formation than the slope in direct sunlight, primarily because chemical weathering processes will be accelerated.
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Compared to a gentle slope, a steep slope will have a
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slower rate of soil formation and less soil.
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Aside from limestone, which other kinds of environments produce karst terrain?
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areas underlain by salt or evaporate rocks, but not sandstone
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Which, if any, of the following is probably NOT important in assessing an area's potential for slope failure?
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All of these are important. (comparing the geologic setting to adjacent areas that have or have not failed whether the material is loose sediment or solid bedrock recent changes in slope the orientation of layering and fractures)
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Which of the following is a feature that commonly forms where limestone has been dissolved?
answer
All of these. (sinkhole karst topography cave)
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What factors lead to the Vajont (Vaiont in textbook) Dam landslide disaster? For a look at old (1960s) TV footage of the disaster, you can check out the video here:
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the rock sedimentary layers were folded at the bottom of a syncline valley, and dipped downslope toward the reservoir.
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Choose the type of land mass movement (picture with the green slope with orange/brown dirt underneath, gentle slope. The scarp has three humps at the top, with the one on the far right being the tallest.)
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Heave
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Sinkhole-formed lakes near Winter Haven, FL. These sinkholes, which often are filled with permeable surficial sands, provide more direct avenues for water from the surficial aquifer system to recharge the underlying Upper Floridan aquifer. (from Spechler and Kroening, 2006) What is karst? (Please choose the most correct and complete answer)
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Terrain with distinctive landforms and hydrology created from the dissolution of soluble rocks (often limestone)
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Beachy Head and the Seven Sisters are famous for their bright white chalk cliffs. The chalk was formed during the Late Cretaceous period (up to 100 million years ago), a time when the area was submerged by the sea. The chalk was gradually pushed up, and rising sea levels cut into the chalk, forming the English Channel and creating a stunning range of undulating cliffs, as shown below. Chemically, these rocks are very similar to those found in Florida. However, the bedrock in Florida is relatively young and developed in a range of ony a few thousand to a few million years ago. What types of rocks are these?
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Limestone
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Choose the type of land mass movement (hill on the left with flat land on the right, there is a white stream on the far right of the picture and a road of some sort going through the middle of the flow)
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Flow
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Choose the type of land mass movement (picture has houses on the bottom, this happened in Cali in the 60s or something. Green land with orange dirt underneath, a lot of land fell onto these houses).
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Slide
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Generally speaking, the rate of solution ___________ as temperature increases. Therefore, chemical erosion will be most rapid and widespread in ____________ climates.
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increases | warm, wet
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Factors that affect the appearance of a shoreline include
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All of these. (the hardness of bedrock along the coast. climate and vegetation. whether sea level has risen or fallen relative to the coast.)
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Which of the following can influence whether a coast gains or loses sand with time?
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All of these. (the amount of precipitation on land the amount of sediment in rivers a longshore current prevailing wind direction)
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Which of the following is NOT an approach communities have tried to address shoreline problems?
answer
lowering the local sea level
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What is the primary reason an increase in glaciation on land would cause sea level to fall?
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Glaciers tie up large volumes of water that would otherwise be in the sea
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What happens to the land surface when large ice sheets melt away?
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The land flexes upward due to isostatic rebound.
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What does LIDAR data tell us about shorelines?
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changes in elevation, including destruction of houses
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This spit is a(n) _______ landform.
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depositional
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What was a key point demonstrated by photographs in the textbook from before and after hurricanes?
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Waves and storm surge caused erosion of beaches and destruction of houses.
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What direction is the longshore drift in this picture? (houses on the left, water on the right. there is a brown thing sticking out near the top right of the photo)
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From the bottom of the page towards the top of the page
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Which of the following statements about the gravitational pull of the Sun and the Moon on tides in the Earth's ocean waters is true?
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During the course of about a month the Sun and Moon both pull together and oppose one another on two occasions.
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Which of the following parts of a coast is more likely to experience intense erosion?
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the seaward end of a promontory (headland)
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Temperatures become more variable and precipitation decreases as one travels from west to east from Europe into Asia. This is best explained by
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prevailing westerlies and the orientation of mountain chains.
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Which of the following is a correct example of global warming creating a positive feedback
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Ice has a higher albedo than water so replacing ice with water causes the surface to warm.
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Where there are abrupt changes in elevation, climate patterns
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change over short distances especially over land.
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In the last 200 years, sea level has risen approximately
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0.2 m.
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General Circulation Models (GCM) differ from Weather Forecasting Models (WFM) in all of the following ways EXCEPT GCM'S
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use spatial analysis techniques that interpolate the data to a three-dimensional grid.
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Summer temperatures are high in arid climates because
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high sun angle and low relative humidity.
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The main National Academy of Science conclusion on global warming since the mid-1800's states
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temperatures have risen around half a degree C.
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Which of the following is NOT likely to be a consequence of climate change?
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increased stability in temperatures
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Köppen's intent in developing his climatic classification system was to correlate temperature and precipitation with
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vegetation.
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Land use changes and exotic species introductions tend to have the impact of
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reducing biodiversity.
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Elevation affects the distribution of terrestrial biomes through its effect on
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both temperature and precipitation.
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Which of the following is true about biomes in general?
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Biogeographers disagree on how many biomes there are, and which types of landscapes should be considered part of the same biome.
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Of the following choices, the environment with the highest net primary productivity is the
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coral reef.
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In the map below, lavender represents
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tundra.
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The effects of global climate change are magnified in mountainside environments because
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there are such narrow belts of different ecosystems that would shift abruptly.
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The environmental boundaries between biomes, called ecotones, are:
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represent a gradual shift in biotic features
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The boreal forest biome is known for its
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coniferous trees.
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The three components of sustainability to which all communities should strive to achieve are
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environmental, economic, and social.
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Temperate rain forests differ from tropical rain forests in that
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temperate rain forests may experience freezing temperatures, but tropical rain forests never do.