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upper atmosphere

   Also found in: Wikipedia 0.04 sec.
upper atmosphere
n.
The part of the atmosphere above the troposphere.
upper atmosphere
The part of the atmosphere above the troposphere. The upper atmosphere includes the mesosphere, the ionosphere, the thermosphere, and the exosphere. Temperatures in the upper atmosphere decrease with increasing altitude except in the thermosphere, where temperatures increase significantly with altitude, because the few molecules present receive intense solar radiation.
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Here they sat down on a luxuriant heap of moss; which at some epoch of the preceding century, had been a gigantic pine, with its roots and trunk in the darksome shade, and its head aloft in the upper atmosphere It was a little dell where they had seated themselves, with a leaf-strewn bank rising gently on either side, and a brook flowing through the midst, over a bed of fallen and drowned leaves.
The Scarlet Letter by Hawthorne, Nathaniel View in context
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