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Geography

Processes affecting rock types

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Limestone solution

The limestone solution process is also known as carbonation.

  1. Limestone is made of calcium carbonate. When carbon dioxide is dissolved in rainwater, it makes a weak acid called carbonic acid.
  2. When carbonic acid comes into contact with limestone and passes through joints and bedding planes, it reacts with the rock to form calcium bicarbonate.
  3. The calcium bicarbonate is soluble and is carried away in solution, gradually weathering the limestone.

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