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.
There are no more uses of "upper atmosphere" in the book.
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Drop it from the upper atmosphere.
Rick Yancey -- The 5th Wave
It was still clear, but a thin, wispy scum of cirrus had spread across the upper atmosphere, and a dark line of squalls was visible just above the southwestern horizon.