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Unit :- 14 How is Soil Formed ?

Unit :- 14 How is Soil Formed ?. ma3I kevI rIte bne 0e ?. Soil is the loose powdery Earth in which plants grow. It is made of very small pieces of rock, decayed plants and materials.

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Unit :- 14 How is Soil Formed ?

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  1. Unit :- 14 How is Soil Formed ? ma3I kevI rIte bne 0e ?

  2. Soil is the loose powdery Earth in which plants grow. It is made of very small pieces of rock, decayed plants and materials.

  3. The rock is so hard that it cannot be broken into pieces. The crumbling and wearing away of rockgoes on all the time. This is called ‘weathering’.

  4. Weathering takes place due to the following factors :

  5. Water with chemicals wears away • some kinds of rocks.

  6. Water with chemicals wears away • some kinds of rocks.

  7. Water with chemicals wears away • some kinds of rocks.

  8. 2. Change in temperature also breaks rocks into small pieces.

  9. 3. Plant roots go into the rocks and break them.

  10. 4.Sometimes seeds fall into cracks, they sprout and grow. This also causes breaks in a rock.

  11. 5.Fast blowing winds also cause wearing away of rocks.

  12. The richest layer of soil is at the top. It is called ‘topsoil’. It is very fertile. It helps grow green vegetables

  13. Plants, trees etc.

  14. Plants, trees etc.

  15. The next layer is called ‘subsoil’. It contains bits of rocks.

  16. Under the subsoil, there is the bedrock. It is almost solid.

  17. If we don’t protect the topsoil, we will perish.

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