Assertion A The atmosphere receives most of the heat only indirectly from the sun and directly from ...........

Geography Atmosphere

Assertion (A): The atmosphere receives most of the heat only indirectly from the sun and directly from the Earth's surface.

Reason (R): The conversion from short waves solar energy to long wave terrestrial energy takes place at the Earth's surface.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

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Explanation:

Insolation is the incident solar radiation onto some object. Specifically, it is a measure of the solar energy that is incident on a specified area over a set period of time. Not all of the solar energy that reaches the Earth actually reaches the surface of the Earth. Although 1367 W/m2 of sunlight strikes the outer atmosphere, about 30% of it is reflected back into space. After this reflection, a certain spot on the Earth might see almost all or almost none of this sunlight. There are many factors that help determine how much sunlight actually reaches a given area, but some of them include sun angle, air mass, day length, cloud coverage, and pollution levels.