(i) Atmospheric carbon dioxide is dissolved in rain water to form a weak acid called carbonic acid.
(ii) The carbonic acid falls on the earth's surface as rain.
(iii) As carbonic acid percolates through limestone rocks,it reacts with rocks along the joints. This reaction changes limestone into calcium bicarbonate which is soluble,and is washed away in solution form. The rocks are dissolved and thus decompose.
maurice.mutuku answered the question on June 6, 2017 at 14:17
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