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Weathering
- Words:
- 708
- Submitted:
- Wed Jul 04 2001
Have a little read: ... * Weathering * Rocks * Earth's Structure Tina Doyle Weathering There are 3 main types of weathering: Physical, Chemical and Biological. * Freeze-thaw weathering - this occurs when rain water seeps into cracks in rocks and if the temperature drops below freezing, the water turns to ice and expansion pushes the rocks apart. This keeps happening each time the water thaws and refreezes. Eventually bits of the rock break off. * Acid rain - this is caused by pollution from the burning of fossil fuels being dissolved in it. Limestone is a very alkaline rock so it is quickly attacked by any acid. It also contains a lot of calcium carbonate. This dissolves in cold rain water to make calcium hydrogen carbonate solution. This reaction is shown in the equation below: Calcium carbonate + Carbonic acid Calcium hydrogen carbonate solution As rain water trickles through cracks in the limestone over many years it can dissolves millions of tonnes of
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