"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
Chalk formations (e,g, The White Cliffs of Dover) erode easily for several reasons:
because 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.
Freeze- thaw
physical weathering
chemical weathering
it does
it does
Freeze- thaw
physical weathering
physical weathering
chemical weathering
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.
freeze and thaw, exfoliation and abrasion
it does
it does
Freeze - Thaw weathering Onion skin weathering Erosion from rain water
freeze-thaw weathering and onion skin weathering.
Freeze-Thaw Weathering Can Only Take Place Whenever The Temperature Falls Below Zero Degrees Celsius.
Please can someone tell me how long the freeze thaw process takes on a rock, thanks :) xx