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About how thick is the biosphere ?
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2 votes
About how thick is the biosphere ?

User Moha Dehghan
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5 votes
Microscopic organisms live at such extremes that, taking them into consideration, the thickness of the biosphere is much greater. Culturable microbes have been found in the Earth's upper atmosphere as high as 41 km (25 mi).
User Friartuck
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4 votes

20 km (Is correct on grad point)

User Pengyy
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8.3k points
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