Lesson 8 Mass Wasting

Question 1

The downslope movement of rock, regolith, and soil under the direct influence of gravity?

Answer 1

Mass Wasting

Question 2

What is the controlling force of mass wasting?

Answer 2

Gravity

Question 3

Factors (4) that influence or trigger downslope movements?

Answer 3

Saturation of the material with water
Oversteepening of slopes beyond the angle of repose
Removal of anchoring vegetation
Ground vibrations from earthquakes.

Question 4

The steepest angle at which a sloping surface formed of a particular loose material is stable?

Answer 4

angle of repose

Question 5

Are oversteepened slopes stable?

Answer 5

no

Question 6

What is it when unconsolidated granular particles assume a stable slope?

Answer 6

the angle of repose

Question 7

What changes depending on the various materials?

Answer 7

stable slope angle

Question 8

What two things does saturation of the material with water do to the material?

Answer 8

Destroys particle cohesion

Water adds weight

Question 9

In the evolution of most landforms, what step does mass wasting follow?

Answer 9

weathering

Question 10

What is produced from the combined effect of mass wasting and erosion by running water?

Answer 10

stream valleys

Question 11

What describes and classifies the various processes of mass wasting?

Answer 11

the type of material involved
the kind of motion
the rate of the movement

Question 12

What are 4 common materials involved in mass wasting?

Answer 12

Debris
Mud
Earth
Rock

Question 13

What are the three movements that can occur with mass wasting?

Answer 13

fall
slide
slow

Question 14

What mass wasting movement involves a free-fall of pieces?

Answer 14

fall

Question 15

What mass wasting movement involves material that moves along a well-defined surface?

Answer 15

slide

Question 16

What mass wasting movement involves material that moves as a viscous fluid?

Answer 16

slow

Question 17

What are the two types of movement?

Answer 17

slow

fast

Question 18

Which forms of mass wasting include the more rapid movements?

Answer 18

slump
rockslide
debris flow
earthflow

Question 19

Which forms of mass wasting include the slow movements?

Answer 19

creep

soliflucation

Question 20

Mass wasting with blocks of bedrock that move down a slope?

Answer 20

rockslide

Question 21

Mass wasting with movement along a curved surface

and along oversteepened slopes?

Answer 21

slump

Question 22

Mass wasting with a flow of debris with water?

Answer 22

Debris flow

Question 23

Mass wasting often confined to channels?

Answer 23

Debris flow

Question 24

Mass wasting with in dry areas with heavy rains?

Answer 24

Debris flow

Question 25

Mass wasting with debris flows composed mostly of volcanic materials on lahars?

Answer 25

Debris flow

Question 26

the flanks of volcanoes

Answer 26

lahars

Question 27

What is debris flow also called?

Answer 27

mudflow

Question 28

Mass wasting that occurs on hillsides in humid regions?

Answer 28

earthflow

Question 29

a special type of earthflow sometimes associated with earthquakes

Answer 29

liquefaction

Question 30

Mass wasting where water saturates the soil?

Answer 30

earthflow

Question 31

Mass wasting associated with liquefaction?

Answer 31

earthflow

Question 32

Mass wasting with slow movement of soil and regolith downhill?

Answer 32

creep

Question 33

Mass wasting that causes fences and utility poles to tilt?

Answer 33

creep

Question 34

Mass wasting in areas underlain by permafrost?

Answer 34

solifluction

Question 35

Mass wasting where upper (active) soil layer becomes saturated and slowly flows over a frozen surface below?

Answer 35

solifluction