Give definitions of Humus :...

Give definitions of Humus :

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The topmost layer of the soil that is formed by the decomposition of the remains of the plants and the animals is called humus.

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Give definitions of Biosphere :
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Give examples of natural resources.
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Give definitions of Humus :
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Name Fossil fuel:
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Match the following :
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Match the following :
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How much surface of the earth is occupied by water and land respective...
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How much is the proportion of the gases in the stratosphere ?
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Why is it said that Water is universal solvent.
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How is water formed ?
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Which useful substances are obtained from crude oil ?
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Why is it said that ………? The ozone layer is a protective shell of the ...
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Why is it said that ………?Water is life.
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How is sea or ocean water useful to us, even though it is salty?
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Explain with the help of a diagram how soil is formed.
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What are the various constituents of air ? Write their uses.
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Why are air, water and land considered to be valuable natural resource...
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Write a short note on 'Air pollution'.
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