Mass Wasting

Question 1

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

Answer 1

Mass wasting

Question 2

does not require a transporting medium such as water, wind, or glacial ice

Answer 2

Mass wasting

Question 3

filling of pores: destroys cohesion
oversaturation: reduces internal resistance
additional weight

Answer 3

Water

Question 4

moves unconsolidated granular materials
produces unstable slopes

Answer 4

Over-steepened slope

Question 5

caused by nature and human activities

Answer 5

Over-steepened slope

Question 6

angle at which material remains stable

Answer 6

Angle of repose

Question 7

slope angle less than the angle of repose

Answer 7

Slope remains stable

Question 8

slope angle grater than the angle of repose

Answer 8

Mass wasting will occur

Question 9

root system bind soil and regolith together
shields soil surface from erosion due to rain

Answer 9

Vegetation

Question 10

dislodge enormous volumes of rock and unconsolidated material

Answer 10

Earthquake

Question 11

loose materials covering the surface of the Earth

Answer 11

Soil

Question 12

unconsolidated rocky material covering bedrock

Answer 12

Regolith

Question 13

mass of bedrock

Answer 13

Rock

Question 14

freefall of detached individual pieces of any size
common in very steep slopes

Answer 14

Fall

Question 15

presence of distinct zone of weakness separating the slide material form the more stable underlying material
types: rotational and translational

Answer 15

Slide

Question 16

material moves downslope as a viscous fluid
usually saturated with water

Answer 16

Flow

Question 17

downward sliding of a mass of rock or unconsolidated material along a curved surface

Answer 17

Slump

Question 18

blocks of bedrock break loose and slide down a slope

Answer 18

Rockslide

Question 19

relatively rapid flow of soil and regolith containing large amount of water

Answer 19

Debris flow

Question 20

viscous downslope movement of saturated clay and silt on hillsides in humid areas

Answer 20

Earthflow

Question 21

gradual downhill movement of soil and regolith due to alternating expansion and contraction of surface

Answer 21

Creep

Question 22

occurs when soil is saturated with water and cannot escape

Answer 22

Solifluction