Why don't all molecules in the atmosphere fall into the Earth like an apple falling from a tree?

Question

Why don't all molecules in the atmosphere fall into the Earth like an apple falling from a tree?, Because molecules are not affected by gravity., Due to the random thermal motion causing their velocity to be non-vertical., Molecules in the atmosphere are too small to be affected by gravity., Molecules are repelled by the Earth's gravitational force.

MARKS App · Accepted Answer

Correct Option is : (B) Due to the random thermal motion causing their velocity to be non-vertical.

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