Rocks - 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.

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

3) There are two types of igneous rocks:

• Extrusive
• Intrusive