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Why does a comet grow a long tail when it nears the Sun?

AIts ice turns to gas in the heat
BEarth's gravity stretches it
CIt starts burning oxygen
DIts rock melts into a stream
Answer & Solution
Correct answer: A. Its ice turns to gas in the heat
The Sun's heat makes the comet's icy surface sublimate into gas and dust that forms the coma and tail.
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