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Igneous rocks
Source: cl.castlelearning.com
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Article summary:

1. Igneous rocks are formed from the cooling and solidification of magma or lava.

2. There are two types of igneous rocks: intrusive (formed underground) and extrusive (formed on the surface).

3. Igneous rocks can be used for construction, as well as providing important clues about the Earth's history and geological processes.

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