Question

Define thermosphere , mesosphere and troposphere

Answer 1

1.The thermosphere is the layer of the Earth's atmosphere directly above the mesosphere
2.The region of the earth's atmosphere above the stratosphere and below the thermosphere is mesosphere
The troposphere is the lowest layer of Earth's atmosphere.

Answer 2

Thermosphere
the region of the atmosphere above the mesosphere and below the height at which the atmosphere ceases to have the properties of a continuous medium.

Mesosphere
the region of the earth's atmosphere above the stratosphere and below the thermosphere, between about 50 and 80 km in altitude.

Troposphere
the lowest region of the atmosphere, extending from the earth's surface to a height of about 6–10 km (the lower boundary of the stratosphere).

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