Question

D. Answer the following questions in brief.
1. Specify two differences between internal and external forces.
2. Name the various agents of gradation.
3. Distinguish between transported and residual soil.
4. How is a delta formed?
5. Why is humus formed more rapidly in humid areas?​

Answer 1

Answer:

Internal forces are the forces that emanate from within a system. The system must be defined by you/problem. External forces are the forces that emanate from outside the system. ... delta is formed by many rivers joining it

Answer 2

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1. Specify two differences between internal and external forces.

Answer:-internal forces take place inside the earth crust while external forces are done by water ,air etc.. internal forces are done when the rock plates move inside earth or show movement external forces acre done when there is pressure of water, air etc.. ... and mostly plains are made due to external forces..

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2.Name the various agents of gradation.

Answer:-The process of erosion, transportation and deposition of rock material is known as gradation. Four agents of gradation are rivers, winds, sea water and glaciers.

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3.Distinguish between transported and residual soil.

Answer:-Transported soil is blown or washed away from its parent rock. Soil that remains at the place of formation is called residual soil. ... The weathered pieces of rocks that have been carried by several agents like wind and water and finally breaks down into further small pieces to settle down is called transported soil.

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4.How is a delta formed?

Answer:-Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land. A river moves more slowly as it nears its mouth, or end.

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5.Why is humus formed more rapidly in humid areas?

Answer:-It is because they get enough water through the water vapour present in the atmosphere due to a huge amount of humidity which ultimately helps in easy humus creation. As bacterias need moisture to grow , in humid areas they reproduce and increase rapidly which results in fast formation of humus.

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