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प्रश्न
A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not dig beyond a depth of 5 feet. Provide a suitable scientific explanation.
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उत्तर
The soil surface has loose top soil which is easier to dig. At deeper layers, partially weathered rocks or bedrocks are present which are hard and make digging difficult.
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संबंधित प्रश्न
Explain how soil is formed.
Sketch the cross section of soil and label the various layers.
Name any four agents of erosion.
What are the components of topsoil?
Name the various methods of conserving soil.
Why is soil conservation important? Give three reasons.
Read the following statements with reference to soil.
- Weathering is a very fast process of soil formation.
- Percolation of water is faster in sandy soils.
- Loamy soil contains only sand and clay.
- Top soil contains the maximum amount of humus.
Choose the correct statements from the above.
Unscramble the following jumbled word related to soil.
\[\boxed{\text{M}}\]\[\boxed{\text{O}}\]\[\boxed{\text{A}}\]\[\boxed{\text{L}}\]
Match the animals in Column I with their natural place of dwelling (habitat) in Column II.
| Column I | Column II | ||
| (a) | Earthworm | (i) | Sand and beaches |
| (b) | Garden lizard | (ii) | Burrows in soil |
| (c) | Crab | (iii) | Deep, narrow holes in dry soils |
| (d) | Rodents | (iv) | Surface of soil |
| (e) | Scorpion | (v) | The surface of shaded moist soils |
| (f) | Snails and slugs | (vi) | A horizon of moist soils |
Gardeners gently dig up the soil around the roots of garden herbs (plants) frequently. Give reasons.
