Question

What are the three types of weathering? Explain each types.
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Answer 1

Answer:

1. Physical Weathering

In physical weathering the rocks are broken down into smaller pieces, but the chemical composition of the rock remains the same.

2. Chemical Weathering

Chemical weathering occurs when rocks are broken down by a chemical change. Rainwater can become slightly acidic by absorbing carbon dioxide in the atmosphere and this reacts with the mineral grains in the rock giving rise to new minerals and salts.

The degree of chemical weathering depends on the type of rock for example limestone is more readily chemically weathered than granite. Other factors such as temperature also play a role as the chemical reactions occur more quickly in areas of high temperatures.

3. Biological Weathering

Biological weathering takes place when rocks are worn away by living organisms. Trees and other plants can grow within the cracks in a rock formation. As the roots grow bigger they push open cracks in the rocks making them wider and deeper. Over time the growing tree eventually prizes the rock apart.

Tiny organisms like bacteria, algae and moss can grow on rocks and produce chemicals which can break down the surface layer of the rock. Burrowing animals such as rabbits can accelerate the formation of cracks.

Answer 2

$\mathbb{ANSWER}$

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The types of weathering are as follows :-

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•Physical or Mechanical weathering.

•Chemical weathering.

•Biotic or Biological weathering.

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Physical Weathering :- It is responsible for the disintegration of rocks by the elements of weather such as heat, frost, wind, plants, man and animals.

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Chemical Weathering :- The decomposition of rocks is known as chemical weathering. It involves the breaking down of rocks by dissolving the rock mineral due to chemical change.

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Biological Weathering :- Biotic factors like plants and animals also cause weathering of rocks. These also involve human activities such as road construction, mining, farming and deforestration.

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