Ch 05.3: Mass Movements

Multiple Select

Which of the following sentences are TRUE about water triggering mass movements? Select all that apply.

• Heavy rains and rapid melting of snow can trigger mass movements by saturating surface materials with water.

• When the pores in sediment become filled with water, the particles slide past one another more easily.

• If there is sufficient water, sand grains will ooze downhill.

• Saturation of the ground with water makes slopes mroe susceptible to the force of gravity.

Multiple Choice

If the steepness of a slope exceeds the stable angle, mass movements become more likely.

• true

• false

Multiple Select

Which of the following are a possible cause of an oversteepened slope? Select all that apply.

• stream undercuts a valley

• waves pound against the base of a cliff

• human excavations for homes and roadways

Multiple Choice

Which of the following does NOT usually trigger mass movements?

• formation of oversteepened slopes

• saturation of surface materials with water

• growth of native vegetation on slopes

• vibration of the ground during an earthquake

Match

Match the following types of mass movement with the correct description.

• a flow that moves relatively slowly - from about a millimeter per day to several meters per day

• the downward movement of a block of material along a curved surface

• a quickly moving mass of material that contains large amounts of water

• when rock or rock fragments fall freely through the air

• slides that include bedrock that move suddenly along a flat, inclined surface

earthflow

slump

mudflow

rockfall

rockslide

• earthflow

• slump

• mudflow

• rockfall

• rockslide