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Viewing: Blog Posts Tagged with: David Toomey, Most Recent at Top [Help]
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1. How High the Biosphere?

Like stratosphere, troposphere, and mesosphere, atmospheric regions with which it shares part of its name, the biosphere is a shell-shaped zone enveloping our planet. But where the others are made of nitrogen, oxygen, water vapor, and trace gases, the biosphere is made of life. It extends in two directions — up and down — farther [...]

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