Rocks - Igneous rocks

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Igneous rocks

1) These are formed from molten (melted) magma which is pushed up to the surface of the crust - and often out through volcanoes.

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Igneous rocks

2) They contain various minerals in randomly arranged interlocking crystals. The size of the crystals (or texture) depends on the speed of the cooling.

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Igneous rocks

3) There are two types of igneous rocks:

  • Extrusive
  • Intrusive
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