Question

1.State the meaning of the term 'soil.
2.List the four main agents of physical weathering.
3.Write one difference between sand, clay and silt.
4.Name the types of soil classified on the basis of soil texture.
5.Give the meaning of the term 'Cohesion
6.List any three causes of soil pollution.
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Answer 1

Explanation:

1. The thin layer of the grainy substance covering the surface of the earth is called soil
2. abrasion.
3. water.
4. Wind.
5. gravity.
6. The largest, coarsest mineral particles are sand. These particles are 2.00 to 0.05 mm in diameter and feel gritty when rubbed between your fingers.

Silt particles are 0.05 to 0.002 mm and feel similar to flour when dry.

Clay particles are extremely fine — smaller than 0.002 mm.

4. The twelve classifications of soil texture are sand, loamy sand, sandy loam, loam, silt loam, silt, sandy clay loam, clay loam, silty clay loam, sandy clay, silty clay, and clay.

5. Unity

6.Soil pollution is mostly caused by mindless human activities such as:

Industrial waste. ...

Deforestation. ...

Excessive use of fertilisers and pesticides. ...

Garbage pollution. ...

Climate change. ...

Loss of soil fertility. ...

Impact on human health. ...

Reforestation

Answer 2

Answer:

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