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The earth is thought to have formed about how long ago?
A13.8 billion years
B4.5 billion years
C2.0 billion years
D0.5 billion years
Answer & Solution
Correct answer: B. 4.5 billion years
Earth formed in the solar system of the Milky Way about 4.5 billion years back; 13.8 billion years is the age of the universe.
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