6. Name any two rocks and their uses.
1. Long Answer Questions.
1. Write a brief note on the formation of soil.
why is soil important for life on the earth? explain
2. Write a short note on clayey soil.
3. How do earthworms act as tiny ploughs?
4. Why is soil important for life on the Earth? Explain
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glish (creative writing/thinking). General Knowledge
Answers
Answer:
6.COAL: A sedimentary rock, formed from decayed plants, is mainly used in power plants to make electricity.
LIMESTONE: A sedimentary rock, it is used mainly in the manufacture of Portland cement, the production of lime, manufacture of paper, petrochemicals, insecticides, linoleum, fiberglass, glass, carpet backing and as the coating on many types of chewing gum.
1.Soil is the thin layer of material covering the earth’s surface and is formed from the weathering of rocks. It is made up mainly of mineral particles, organic materials, air, water and living organisms—all of which interact slowly yet constantly.
Soil is our life support system. Soils provide anchorage for roots, hold water and nutrients. Soils are home to myriad micro-organisms that fix nitrogen and decompose organic matter, and armies of microscopic animals as well as earthworms and termites. We build on soil as well as with it and in it
2.
Clay soils feel very sticky and rolls like plasticine when wet.
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They can hold more total water than most other soil types and, although only about half of this is available to plants, crops seldom suffer from drought.
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They swell when wetted and shrink when dried, so a certain amount of restructuring can take place in these soils depending on weather conditions.
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They lie wet in winter and so stock should be taken off the land to avoid poaching (the compaction of soils by animals’ hooves).
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They are very late in warming up in the spring because water heats up more slowly than mineral matter.
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They are normally fairly rich in potash, but are deficient in phosphates.
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Clay soils usually need large infrequent dressings of lime
3.GreenMyLife
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Earthworms – Nature’s Plough
May 15, 2014
Earthworms
Many of us have heard that earthworms are a gardener’s’ best friends. But, is it true? How can an icky and slimy creature be helpful in any way?! Read more to learn about this.
Well, the fact is that these little crawlers and wigglers may be the key factor in the success of your garden. They help to such an extent that many people refer to them as “Nature’s Plough”, and rightly so.
earthworms
Encourage earthworms to your garden with tasty degradable organic matter!
As avid gardeners, we all know that the soil needs to be ploughed regularly so as to break the soil to allow a regular supply of air and water to the seeds and roots of plants. Without this supply, our plants would not nourish. This is where our tiny friends come to play. Earthworms push through the soil through their heads and form tiny tunnels which are interconnected to each other. These tunnels are several feet deep. Thus, the earthworms act like ploughs by naturally ploughing our soil and aerating it as well as letting in the necessary supply of air and water, helping plants to grow.
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