Answer:

A. The sun's vertical rays strike the Tropic of Cancer, 23.5° north of the Equator, during the June solstice. The subsolar point then begins its migration south, and vertical rays strike the Tropic of Capricorn, 23.5° south of the Equator, during the December solstice.

B. Because the Earth is round, not all of the Sun's rays strike the Earth in a vertical, or direct, manner. These less direct rays are called oblique rays. Oblique rays are spread out when they strike the Earth, and because of this they lose some of their heat.

Explanation:

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