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Name: Kiari
Status: student
Grade: K-3
Location: OK
Country: USA
Date: Spring 2012
Question:
About how long does it take for rocks to form?


Replies:
The time it takes for rocks to form depends upon many things. Mostly it depends on the kind of rock.

Lava from a volcano becomes rock as soon as it cools. If the lava flows into the ocean, it can cool in just a few minutes. Rocks that form when water dries up, like rock salt, can form in a few days.

Other kinds of rock can take thousands or millions of years to form.

This may not the answer you were looking for, but I hope it helps.

Bob Avakian


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