Question

Name the three types of weathering. 3. What do you understand by denudation? 4. How does frost cause weathering of rocks? 5. In what ways does atmosphere assist in weathering? 6. What is meant by chemical weathering? 7. How does biological weathering take place? | What do you understand by mechanical weathering? ​

Answer 1

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Name the three types of weathering.

---› There are three types of weathering, physical, chemical and biological.

What do you understand by denudation?

---› Denudation is the name for the processes of erosion, leaching, stripping, and reducing the mainland due to removal of material from higher to lower areas like valleys, river valleys, lakes and seas with a permanent filling of low lands.

How does frost cause weathering of rocks?

---› The disintegration of the bedrock due to changes in temperature and freezing action of water by mechanical process is called physical weathering e.g. frost or snow lying between the cracks forces to expand the rocks cracks which helps in disintegration.

In what ways does atmosphere assist in weathering?

----› Atmosphere gives us oxygen to breathe and protects us from the sun's harmful rays called ultraviolet rays. It also helps to retain the Sun' heat on the Earth.

What is meant by chemical weathering?

---- ›Chemical weathering is the process by which rocks are broken down by chemical reactions. There are different types of chemical weathering. Hydrolysis is the chemical breakdown of a substance when combined with water. The most common example of hydrolysis is feldspar in granite rocks changing to clay.

How does biological weathering take place?

----› Biological weathering takes place under the influence of life activities of organisms. The changes occur by the growth of roots, and drilling of organisms (shells, lichens, cyanobacteria, algae and the fungi) in the rock on which they cultivate.

What do you understand by mechanical weathering?

-----› Mechanical weathering is also known as physical weathering. In this type of weathering, a large rock is disintegrated into smaller pieces of rocks. When rocks disintegrate or break up without experiencing any change in their chemical composition, it is known as mechanical weathering.