Short Answer Type Questions
1. What are chemical fertilizers ? Write their harmful effects.
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2. What are the various components of soil ?
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3Why do soil reflect on a hot summer day?
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4 Explain, why soil is an inseparable part of our life?
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5. What do you mean by weathering?
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Long Answer Type Questions
1 classify soil on the size of the soil ?
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2 write about soil erosion?
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3 explain a method of making earthen pots ?
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4 explain the soil profile?
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Class 7
Answers
Answer:
1 ) Some of the harm chemical fertilizers may cause include waterway pollution, chemical burn to crops, increased air pollution, acidification of the soil and mineral depletion of the soil.
2 ) Soil Layers. Soil is composed of both biotic—living and once-living things, like plants and insects—and abiotic materials—nonliving factors, like minerals, water, and air. Soil contains air, water, and minerals as well as plant and animal matter, both living and dead. These soil components fall into two categories.
3 ) On a hot summer day, the vapour coming out of the soil reflects the sunlight and the air above the soil seems to shimmer.
4 ) (i) Soil is the most important natural resource. It supports the growth of plants by holding the roots firmly. (ii) It helps in supplying water and nutrients to plants. ... Soil is thus an inseparable part of our life.
5 ) Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering.
1 ) Soil particles vary greatly in size, and soil scientists classify soil particles into sand, silt, and clay. Starting with the finest, clay particles are smaller than 0.002 mm in diameter. Some clay particles are so small that ordinary microscopes do not show them. Silt particles are from 0.002 to 0.05 mm in diameter.
2 Soil erosion is defined as the wearing away of topsoil. ... The impact from the raindrops loosens topsoil, allowing small fragments to detach. If the rainfall continues, water gathers on the ground, causing water flow on the land surface, known as surface water runoff, which carries soil away and deposits it elsewhere.
3 ) 3rd question I don't know. sorry for that.
4 )soil profile is a vertical section of soil like the diagram above. It allows you to examine the structure of soil. A soil profile is divided into layers called horizons. The main soil horizons are A, B, C and D. ... The A horizon is where there is most soil life and is sometimes called topsoil.
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