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Most surface rocks on the Earth are younger than a few million years old, whereas ages of lunar ...

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Most surface rocks on the Earth are younger than a few million years old, whereas ages of lunar ...

Most surface rocks on the Earth are younger than a few million years old, whereas ages of lunar rocks have been measured in billions of years. Why is this?
A)   Much of the Earth's surface is continually recycled (created and subducted) by the underlying mantle because of plate tectonic activity; this does not occur on the Moon.
B)   Most early surface rocks on the Earth have been washed into the sea by weathering and rainwater; this does not happen on the Moon.
C)   The complete surface of the Earth has been covered periodically by younger material from intense volcanic eruptions in the last few million years; no such activity occurred on the Moon.
D)   The ages of the Earth and the Moon are fundamentally different, the Moon being an old object captured from space by a younger Earth.

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Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

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