Landslides, mudflow, slump and creep are all examples of
a.
constructive force
c.
mass movement
b.
deconstructive force
d.
none of the above
answer
C. Mass movement
question
Waves erode the coast by crashing on the rocks or by abrasion.
TRUE OR FALSE
answer
TRUE
question
Abrasion and carrying load containing sediment are examples of
a.
land erosion
c.
water erosion
b.
load effect
d.
none of the above
answer
C. Water erosion
question
Glaciers cause erosion through plucking.
TRUE OR FALSE
answer
TRUE
question
Wind blowing sediment against rock or land area, or sandblasting is called
a.
abrasion
c.
deflation
b.
deposits
d.
picking up
answer
A. Abrasion
question
Ground water erosion can result in the formation of stalactite and stalagmite in caves.
TRUE OR FALSE
answer
TRUE
question
Identify landform B, explain how it forms, and tell whether it is the result of erosion or deposition.
answer
B is a wave-cut cliff and is the result of erosion. It forms when waves erode the base of the land along a coast to the point of the rock above collapsing.
question
What causes a mudflow?
answer
A mudflow can occur when soil that is usually dry become soaked with water. If the soil is especially high in clay content, mudflows con occur on very gentle slopes. Earthquakes can also trigger mudflows.
question
Glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as ____________________.
answer
Plucking
question
Compare and contrast the way the two types of glaciers move.
answer
Continental glaciers can cover most of a continent or large island. As they move, they can spread out in all directions. In contrast, valley glaciers move down mountain valleys previously cut by rivers. The sides of mountains prevent valley glaciers from spreading in all directions as continental glaciers do.
question
A kind of glacier called a(n) ____________________ forms when ice and snow build up in a mountain valley.
answer
Valley Glacier
question
Explain what is meant by a river's load, and describe how the load is carried.
answer
Sediment load refers to the amount of sediment that a river can carry. Rivers carry their load in different ways. Large particles are pushed and rolled along the bottom of the river bed, and some sand is bounced along. Fast-moving water lifts sand and other small sediment and carries it downstream. Some larger particles of sediment are broken down by the water and carried away.
question
Explain how water erosion by groundwater can form a cave.
answer
Groundwater can cause erosion through chemical weathering. First, water that sinks into the ground mixes with carbon dioxide to form carbonic acid, a weak acid. Carbonic acid can break down limestone. Some of the limestone changes chemically and is carried away in a solution of water. This gradually hollows out pockets in the rock. Over time, these pockets develop into large holes underground—caves or caverns.
question
The stronger the wind, the larger the particles it _____________ (deposits/erodes).
answer
Erodes
question
What is the main agent of erosion that has shaped much of Earth's surface?
answer
Water
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