Summer in the northern hemisphere is warmer primarily because of ?
i. increased atmospheric absorption of solar radiation
ii. the tilt of earths axis
iii. reduced albedo

Increased atmospheric absorption of solar radiation and the tilt of Earth's axis.

Explanation:

Earth is tilted 23.5 degrees which allows the sun's rays to hit Earth at a more direct angle. The tilt of the Earth also creates its seasons hence why it is cold in the winter and opposite in the summer.

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