Which effect does the sun's energy have on a comet? A. It causes the comet to form a bright tail.
B. It causes the core of the comet to melt.
C. It causes the comet to turn toward earth.
D. It causes the comet to break apart.

The answer is B because the sun melts the core of the comet

it is b

Explanation: the sun is so hot that the core of comet melts

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and after water is usually warmed by the sun the water temperature raises and then evaporates .