sub aerial processes

Question 1

Weathering and mass movement are

Answer 1

Sub-aerial Processes

Question 2

The Holderness coast is predominately

Answer 2

boulder clay

Question 3

This leads to particular sub-aerial processes:
Wetting and drying

Answer 3

At high tide the particles expand when covered with water, at low tide they dry out and contract

Repeated wetting and drying causes the clay to crumble

Question 4

Freeze-thaw

Answer 4

During the winter months, water enters the fractures in the boulder clay

At night this water freezes and expands - due to Arctic maritime air masses
Repeated expansion and contraction, causes the cliff to be weakened

Question 5

Slumping

Answer 5

The Holderness coast regularly experiences wet weather
Weathering leaves cracks in the boulder clay

Water enters these cracks, causing the clay to become heavier, and lubricated (slippery)

This leads to a large area of land moving downslope in one piece - known as rotational slip

Question 6

Along the Holderness coast, weathering and mass movement work together, causing the fastest rate of coastal erosion in Europe
The rate of erosion is approximately

Answer 6

1.8m a year