Q.

The atmospheric layer closest to the earth is:

A. Mesosphere
B. Hydrosphere
C. Troposphere
D. Ionosphere
Answer» C. Troposphere
Explanation: The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its water vapor and aerosols. Most of the phenomena we associate with day-to-day weather occur in the troposphere.
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