Rock Notes. Igneous Rocks. Forms as Magma or Lava Cools. Two Types Intrusive: Forms underground in crust Cools very slowly so crystals have time to grow Looks spotted from crystals Extrusive: Forms on surface as lava cools Cools very quickly so no crystals
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Cools very slowly so crystals have time to grow
Looks spotted from crystals
Cools very quickly so no crystals
has no crystals or is glassy or has air holes.
Form as sediment (weathered rock) piles up and glues together.