Q17 of 287 Page 345

Biological weathering is caused by

Lichens and mosses release chemicals on rocks that cause them to powder down and form layers of soil. Roots of plants in the cracks of rock cause the rock to expand and break.

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Soil that is best suited for plant growth is

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Sun causes weathering of rocks through

 18

Wind breaks are

 19

Signs of eutrophication of water bodies include