Igneous rocks

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There are three main types of rocks classified by how they are formed. Igneous rocks form from melted rock and can be either extrusive or intrusive. Extrusive igneous rocks cool quickly on the surface to form fine crystals like basalt and obsidian, while intrusive igneous rocks cool slowly inside the Earth to form larger crystals such as granite and gabbro. The size of crystals in igneous rocks depends on whether they cool quickly on the surface or slowly underground.

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Igneous rocks

1. Igneous Rocks

9. Classification is based on crystal size and composition.

10. magma igneous rock lava intrusive extrusive

11. small extrusive; small grain size gabbro has a large grain size intrusive; its large grain size

Igneous rocks

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