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"The cliffs (of Dover on the Brittish Coast) themselves are still under attack from the sea as its continuous flow eats away at the soft chalk at the base of the cliffs. About 2-5cm on average are lost each year, but more than a metre can be lost in one large cliff fall, and as sea-levels rise the cliffs will probably retreat more quickly"...National Trust
http://www.nationaltrust.org.uk/main/w-index.htm
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoChalk formations (e,g, The White Cliffs of Dover) erode easily for several reasons:
- Chalk is a friable rock, it breaks apart easily under mechanical stress (heating and cooling, freezing and thawing, things rubbing against it)
- Chalk is chemically reactive, acidic rains (even normal rain) dissolves it
- Chalk absorbs water making it break up on freezing
Wiki User
∙ 12y agobecause chalk is pourus(has lots of holes) and therefore, if lots of holes fill up with enough water and freeze repeatedly, more of the chalk will fall off as scree.
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What types of weathering affect chalk?
Freeze- thaw
What is another example of freeze-thaw weathering?
physical weathering
Freeze-thaw is an example of?
chemical weathering
How do freeze and thaw cycles contribute to both weathering and erosion?
it does
How do freeze and thaw cycle contribute to both weathering and erosion?
it does
What types of weathering affect chalk?
Freeze- thaw
What is another example of freeze-thaw weathering?
physical weathering
Freeze-thaw is an example of this?
physical weathering
Freeze-thaw is an example of?
chemical weathering
Why is freeze thaw weathering absoloutely vital if a glacier is going to be able to erode its valley?
Its to do with how it is able to form the glacier. There is a cylce where the ice can only cycle round and round if freeze thaw weathering is taking place, meaning that a glacier can erode its valley. The process of freeze thaw weathering erodes the valley.
What types of mechanical weathering are there?
freeze and thaw, exfoliation and abrasion
How do freeze and thaw cycles contribute to both weathering and erosion?
it does
How do freeze and thaw cycle contribute to both weathering and erosion?
it does
3 example of physical weathering?
Freeze - Thaw weathering Onion skin weathering Erosion from rain water
What are two processes that can break rocks apart?
freeze-thaw weathering and onion skin weathering.
What type of wather conditions are needed for freeze thaw weathering to take place?
Freeze-Thaw Weathering Can Only Take Place Whenever The Temperature Falls Below Zero Degrees Celsius.
How long does freeze thaw weathering take?
Please can someone tell me how long the freeze thaw process takes on a rock, thanks :) xx
