Describe the following process of weathering.
i)Alternate wetting and drying.
ii)Carbonation.
Answer:
Alternate wetting and drying:
-this is effective in regions experiencing a definite wet and dry season/in desert regions.
-It is common in rocks containing clay. The clay absorbs moisture when it rains which makes it swell/increase in size. When the dry season comes, the particles loose the water, making them shrink. The alternate swelling and shrinking make the particles to detach themselves, falling away. The rock thus disintegrate. This is called alternate wetting and drying.
Carbonation:
-atmospheric carbon dioxide is dissolved in rain water to form weak acidic called carbonic acid.
-The carbonic acid fall on the earth’s surface as rain. As carbonic acid percolates
through limestone rocks, it reacts with the 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. This is carbonation.
-this is effective in regions experiencing a definite wet and dry season/in desert regions.
-It is common in rocks containing clay. The clay absorbs moisture when it rains which makes it swell/increase in size. When the dry season comes, the particles loose the water, making them shrink. The alternate swelling and shrinking make the particles to detach themselves, falling away. The rock thus disintegrate. This is called alternate wetting and drying.
Carbonation:
-atmospheric carbon dioxide is dissolved in rain water to form weak acidic called carbonic acid.
-The carbonic acid fall on the earth’s surface as rain. As carbonic acid percolates
through limestone rocks, it reacts with the 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. This is carbonation.
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