2B.6b,c Sub-aerial processes

Question 1

mass movement

Answer 1

the downslope movement of material under the force of gravity

Question 2

example of unconsolidated material

Answer 2

in boulder clay, slumping may occur

Question 3

example of consolidated material

Answer 3

in limestone and granite, sliding may occur

Question 4

name 3 mass movement examples

Answer 4

block/rockfalls
rotational slip/ slumping
landslides

Question 5

block/rockfall

Answer 5

rock fragments break away and drop vertically
-initiated by mechanical weathering or marine erosion
-having joints, faults and bedding planes, steep or vertical dip of strata makes cliff prone to rockfalls

Question 6

rotational slip/ slumping

Answer 6

rock failure and movement along a curved rock plane, slower movement than rockfall
occurs in weaker rocks (clays), unconsolidated materials (boulder clay, sands) and complex geology rock

slumping is facilitated by the presence of water (adding weight)

Question 7

landslides

Answer 7

the downslope movement of discrete blocks of rock down a flat slip plane, they are released by mechanical weathering off well jointed rocks
-can be caused by marine erosion off a cliff foot, undercutting blocks weakened by jointing
they occur in consolidated rocks with joints or bedding planes, sloping seawards

Question 8

what landform can blockfalls form?

Answer 8

tallus scree slope

Question 9

tallus scree slope

Answer 9

-blockfalls
the undercutting of cliffs by the creation of wave-cut notches can lead to large falls and talus scree slopes at the base
A FAN SHAPED MOUND OF MATERIAL

Question 10

what landform can rotational slumping expose?

Answer 10

rotational scar

Question 11

rotational scar

Answer 11

rotational slumping
-the detached slope section forms a beach or terraced cliff profile e.g. Naish Farm, ChristChurch Bay
A FRESH, CURVED, UNWEATHERED AND UNVEGETATED ROCK SURFACE ON THE CLIFF FACE