SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Chemical weathering happens over much shorter time frame than mechanical weathering.
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Chemical weathering changes the chemical composition of rocks; mechanical weathering does not.
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Chemical weathering occurs only in tropical climates; mechanical weathering occurs only in cool climates.
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Chemical weathering occurs only in the mountains; mechanical weathering occurs only on flat land.
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Detailed explanation-1: -Mechanical weathering breaks rocks into smaller pieces without changing their composition. Ice wedging and abrasion are two important processes of mechanical weathering. Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth’s surface.
Detailed explanation-2: -Chemical Weathering Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock.
Detailed explanation-3: -Chemical weathering changes the composition of a mineral to break it down. As rock breaks into smaller pieces, the surface area of the pieces increases. As plant roots take in nutrients, they remove elements from the minerals. This causes a chemical change in the rock that is called oxidation.
Detailed explanation-4: -How does composition of rock affect mechanical weathering? Ans. 9 The composition of rocks and climate also affect rates of weathering. The rate at which a rock weathers is affected by the amount of the rock’s surface that is exposed to chemical weathering processes.
Detailed explanation-5: -Physical weathering may result due to temperature, pressure, snow, etc. whereas chemical weathering mainly takes place due to the action of some chemicals.