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The Igneous Rock Cycle starts off with any type of rock. The rock gets pulled down from the Earth's surface and starts heating up until it finally melts.
Magma is the product of completely melted rock and is the way that igneous rocks are formed. When magma gets shot out through a volcano vent and turns into lava to cool it is called extrusive igneous rock. Or it stays underneath the Earth's crust and cools which is intrusive igneous rock.
The lava cools and hardens (crystallizes) fast because it is exposed to the cooler air that creates small crystals. Sometimes if the rock cools extra fast then the rock will have marks where bubbles were so it looks like there are little holes in the rocks.
Because the magma is getting cooled underneath the Earth's surface it cools slowly and makes large crystals. Intrusive igneous rock can also get melted back into magma. Ex: Granite.