Salutations!
The biosphere is composed of all living organisms. Biosphere is a region of the earth's surface where all living organisms are able to live.
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The are where an oceanic plate descends into the upper mantle is called a subduction zone.
optical telescope (Hubble), X ray telescope ( Chandra) etc.
get around the Earth's atmosphere so that we can get a clearer view of the planets, stars, and galaxies that we are studying.
Ir is the third opinion, 100km area
