Earth is about ________ years old.

A. 50 million
B. 3,500 million
C. 13.5 billion
D. 4.5 billion
E. 30,000 thousand


Answer: D

Environmental & Atmospheric Sciences

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What will be an ideal response?

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What will be an ideal response?

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The process by which ice evaporates directly from the surface of a glacier is known as

____________________. Fill in the blank(s) with the appropriate word(s).

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