Exam 13: Mass Wasting

In ____,soil in which fine grains predominate moves downslope as a viscous fluid.

Assuming that all other conditions are identical,a slope that is ___ is more stable.

Permafrost occurs at depths that range from a few centimeters to a few meters below the ground surface.

______ is ground that remains frozen for many years.

The impermeable layer beneath saturated soil subject to solifluction may be ______.

____ generally makes a slope more susceptible to mass wasting of soil.

Mudflows are ___ likely to occur in areas not protected by vegetation.

Which of the following factors are how geologists,engineers,and others classifying mass wasting?

If,over a period of time,your home develops doors that stick,cracked walls,broken pipes,and cracked driveways,____ may be occurring.

Pore pressure refers to the effect in which water forces grains apart.

Viscosity is the resistance to movement of the material.

A mudflow is a flowing mixture of soil and water usually moving down a channel.

The term "mass wasting" refers to the improper use of Earth materials in a manner that is in conflict with the principles of conservation and environmental stewardship.

In an earthflow soil moves downslope as a coherent mass.

The term "debris," implies that coarse-grained fragment predominates in the soil.

Surface tension created by a small amount of water in soil decreases its shear strength.

When a stream,wave action,or excavation by humans undercuts the base of a slope,slope failure may occur because __.

Most solifluction takes place __.

The 1928 failure of the St.Francis Dam near Los Angeles was due to _____.

If movement becomes very rapid,a rockslide may break up and become __.