Ch. 15

Which of the following has the lowest potential for landslides? Pacific Northwest southern California bluffs along rivers in the central U.S. Florida Appalachian Mountains

What type of slope failure is shown in this figure? creep debris flow rock fall rock slide rotational slide

Which of the following does NOT physically loosen rocks on the surface? water contracting as it freezes crystals of salt and other minerals that exert an outward force on fractures roots that pry apart fractures as the root grows in size joints that form when rock pressures are released rodents and other burrowing organisms

Some rocks and minerals are not stable at the surface because they: are exposed to water formed in high-temperature environments formed in high-pressure environments are exposed to oxygen all of the above

Where does the quartz in granite typically end up? as small clay minerals that are deposited in lakes and the sea quartz does not weather and so it keeps the granite from weathering it ends up as sand in rivers, dunes, and beaches it is converted into feldspar and weathers into clays

How does the character of a rock influence weathering fractures and other discontinuities block the entry of water into a rock and so make the rock more resistant to weathering minerals that are soluble can be dissolved and deposited and so are resistant to weathering rocks that are broken have more surface area and so weather faster rocks that are easily weathered and eroded generally form steep cliffs none of the above

Which of the following factors does NOT control the stability of a slope? the angle of repose for intact bedrock whether the slope is rock or soil the amount of water in the soil the orientation of fractures, cleavage, and bedding

Which of the following factors is typically NOT used to classify slope failures? whether the material involved is rock or is unconsolidated the rate of movement the climate in which the failure occurs the mechanism by which material moves

Which of the following factors favors movement of a rock slide? layers that are inclined opposite to the slope of the hill solid rock with few preexisting joints or faults a massive rock with no bedding or other through-going discontinuities a valley or other open space downslope from the rock slide all of the above

Which of the following slope failures is least likely to cause casualties? rock avalanche debris flow creep rock slide rock fall