Biosphere is part of earth where we exist. It consists of highly integrated and interacting zone comprises of atmosphere, hydrosphere and lithosphere.

Biosphsre is absent in extremes of the north and south poles, highest mountains and deepest oceans. As it is hostile conditions as they do not support life.

* * All the Notes in this blog, are referred from Tamil Nadu State Board Books and Samacheer Kalvi Books. Kindly check with the original Tamil Nadu state board books and Ncert Books.
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