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What causes the structures of igneous rocks to be different

Igneous rocks can have many different compositions, depending on the magma they cool from. They can also look different based on their cooling conditions. ... Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground.

Explanation:

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I think its cause Igneous rocks have different compositions, but it depends on the type of magma they cool from. Their cooling conditon can also cause them to be different.

Hope this helps :)

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what is a measurement of the earth’s history divided into time periods?

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sedimentary rock

> geologic time scale <

radioactive elements