tro|po|sphere «TROH puh sfihr», noun.
the lowest region of the atmosphere, between the earth and the stratosphere, extending to about 10 miles above the earth's surface. Within the troposphere, there is a steady fall of temperature with increasing altitude. Turbulence of the air and most cloud formations occur in the troposphere.
╂[< French troposphère < Greek trop
a turn, a change + sphaîra sphere]
a turn, a change + sphaîra sphere]Useful english dictionary. 2012.