Solution or carbonation weathering

The limestone solution process is also known as carbonation.

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