Mass movement

Question 1

Defintion

Answer 1

The downslope movement of weathered consolidated and unconsolidated material under influence of gravity

Question 2

Factors affecting rate

Answer 2

Degree of cohesion of weathered material

Steepness of the slope and amount of water contained

Question 3

Landslides

Answer 3

Occur on cliffs made from softer rocks deposited material
Slip as a result of failure within in when lubricated
usually following heavy rainfall

Question 4

Rockfalls

Answer 4

Occur from cliffs undercut by the sea or on slopes affected by mechanical weathering

Question 5

Mudflows

Answer 5

Heavy rain can cause quantities of fine material to flow downhill
Increase in the water content of soil can reduce friction, leading to earth and mud to flow over underlying bedrock​or slippery materials such as clay.
Water can get trapped within the rock increasing ​pore water pressure​, which forces rock particles apart and therefore weakens the slope

Question 6

Rotational slip/slumping

Answer 6

Softer material overlies much more resistant materials
Cliff slides down in rotation movement
Process repeats

Question 7

Soil creep

Answer 7

slow continuous movement of soil particles downslope