Rocks that cool within the Earth’s crust, intrusive igneous rocks, cool slowly and thus have coarse crystalline grains, whereas, rocks that cool on the surface of the Earth, extrusive igneous rocks, cool relatively quickly.
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There are laws of relative dating which guide geologists to be able to determine the relative age of rocks.
Different radioactive isotopes are useful for dating different rock samples, as those with a shorter half-life are only useful for dating younger rocks.
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