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Difference Between Chemical and Physical Weathering. Weathering processes crack, wear away, and weaken rocks. ... While physical weathering breaks down a rock's physical structure, chemical weathering alters a rock's chemical composition.
Physical weathering occurs when the rocks or minerals break down into fine particles over a period of time due to physical factors of the environment. This factors include wind, water, sun, ice and temperature changes.
Chemical weathering occurs when rocks or minerals changes in their chemical composition due to exposure to the environment. Chemical weathering involves chemical changes that decompose, dissolve or break down various parts of the rocks.
Biological weathering occurs when rocks are worn away by living organisms. The roots of each plants and trees reach deep within the cracks in a rock in search of water and nutrients. As the roots grow bigger, they push the cracks wider and deeper, resulting in breakdown of rocks.
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