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Igneous rocks
Source: cl.castlelearning.com
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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