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Answer: troposphere
Answer	Crossword Clue
troposphere	a region of the atmosphere from 25,000 feet to 55,000 feet, the boundary between the upper troposphere and the lower stratosphere
troposphere	The lowest region of the atmosphere, extending from the earth's surface to a height of about 6û10 km (the lower boundary of the stratosphere)

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: troposphere