Sub Arial Proceses - Mass Movement

Question 1

What is mass movement (3)

Answer 1

Downhill movement of sediment under the influence of gravity
Transfers energy and sediment
Input of sediment on coastline

Question 2

What are the types (7)

Answer 2

Soil creep
Rockfall
Landslip
Mudflow
Landslide
Runoff
Solifunction

Question 3

What is soil creep (3)

Answer 3

Soil particles move slowly down slope
Slowest form of mass movement
More likely when soil is wet

Question 4

What’s rockfall (3)

Answer 4

Sudden
Fragments break from cliff due to weathering
Scree at bottom

Question 5

What is landslip (3+)

Answer 5

Softer material overlies much more resistant materials
With lots of lubrication whole sections of the cliff face move downwards
Move along a CONCAVE slide plane = rotational movement

Question 6

Mudflows what (4+)

Answer 6

Fine particles of mud flow down the face of cliffs
Sudden and fast flowing = natural hazard
Water aids flow = rapid = makes material heavier
Form a lobe

Question 7

What is a landslide (3)

Answer 7

Occur on cliffs made from softer rocks = slope failure
Triggered by heavy rain as water can lubricate less consolidated material
Triggered by earthquakes

Question 8

Runoff what (2)

Answer 8

Overland flow occurs down a slope or cliff face
Small particles may be moved downslope/ onto the beach/ into the sea

Question 9

Solifunction what (2)

Answer 9

Frozen soil melts and becomes saturated
Creeps downhill over a layer of permafrost

Question 10

Natures of movements types (4)

Answer 10

Creep = slow
Flow = presence of water
Fall = down
Slide = lateral flow down