The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is _________.
(i) Stratosphere
(ii) Troposphere
(iii) Mesosphere
(iv) Hydrosphere
The answer is the option (ii) Troposphere
Explanation: It extends up to approx. 10 km of height from sea level, and is the lowest region of the atmosphere, where humans live.