Costal Weathering And Erosion

Question 1

What is mechanical weather

Answer 1

The breakdown of rock without changing its chemical composition

Question 2

What is chemical weathering

Answer 2

The breakdown of rock by changing its chemical composition

Question 3

How is freeze thaw weathering occur

Answer 3

Water gets into rocks with cracks
Water freezes and it expands
The water thaws and contracts which releases the pressure on the rock
The rock is hard to break up

Question 4

How is carbonation weather formed

Answer 4

Rainwater has CO2 dissolved in it which is a weak carbonic acid
Carbonic acid reacts with rock that contains calcium carbonate
Rocks are dissolved by rain water

Question 5

What is mass movement

Answer 5

The moving of rocks and loose materials down a slope

Question 6

What is slides in mass movement

Answer 6

Material shifts in a straight line

Question 7

What is slumps in mass movement

Answer 7

Material shifts with a rotation

Question 8

What is rockfall in mass movement

Answer 8

Material breaks down and falls down the slope

Question 9

How is a wave cut platform form

Answer 9

Erosion at the foot of the cliff
Forms wave cut notch
Rock above comes unstable and then collapses
Collapsed material is then washed away and a new wave cut notch is formed
Repeated collapsing results in cliff retreating
Wave cut platform is left behind

Question 10

How is a headland and bays formed

Answer 10

Headlands are more resistant so they don’t erode

Bays are less resistant so they are susceptible to erosion and forms beaches

Question 11

How is a stump formed

Answer 11

Headland gets eroded due to hydraulic action to form weakness cracks
Forms a wave due to continuous erosion of hydraulic action and abrasion
Erosion form a arch by pushing the cave through by erosion
Biological weathering undercuts the arch and it becomes weak and collapses to form a stack
Due to constant weathering the stack weathers down to a stump