Rock Formation Time
Date: Spring 2012
About how long does it take for rocks to form?
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.
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Update: June 2012