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Geology
Math and Arithmetic
Rocks and Minerals

Why would it be helpful to find a million year old rock?

Answer

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February 16, 2011 4:55PM

It would not be helpful (unless you just happened to need a rock for something) because the earth is about 4.6 billion years old, and there is much older rock, so there is nothing particularly notable about one that is a million years old.

In certain special circumstances, it could be used to put an upper limit on the age of something. For example, a million year old rock that had been carved into the shape of a horse would mean that it had, necessarily, been carved less than a million years ago.