Costal Weathering And Erosion Flashcards Preview

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Flashcards in Costal Weathering And Erosion Deck (11):

What is mechanical weather

The breakdown of rock without changing its chemical composition


What is chemical weathering

The breakdown of rock by changing its chemical composition


How is freeze thaw weathering occur

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


How is carbonation weather formed

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


What is mass movement

The moving of rocks and loose materials down a slope


What is slides in mass movement

Material shifts in a straight line


What is slumps in mass movement

Material shifts with a rotation


What is rockfall in mass movement

Material breaks down and falls down the slope


How is a wave cut platform form

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


How is a headland and bays formed

Headlands are more resistant so they don’t erode
Bays are less resistant so they are susceptible to erosion and forms beaches


How is a stump formed

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