The gaseous envelope around the earth is known as the atmosphere. The lowest layer of this is extended up to 10 km from sea level, this layer is _________.
Troposphere is the lowest layer of the atmosphere. It extends upward to about 10km above sea level. And it is followed by another layer named stratosphere and then mesosphere. The hydrosphere includes water that is on the surface of the planet, underground, and in the air.
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