What is 'biosphere'?
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Biosphere is the life zone of the earth. It is that part of the earth's terrestrial system - including air, land and water - in which life develops and where life processes in turn get transformed.
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What is the earth's mean temperature? State its one advantage.
Why is the earth called a watery planet?
Name the conditions necessary for life on earth.
Give any two features of the earth that make it a 'Unique Planet'.