Igneous Rock, Rock formed when hot, melted rock (magma or lava) cools and hardens. Think of it as rock made from fire!, Sedimentary Rock, Rock formed when tiny pieces of broken rock, sand, or shells (called sediment) are squeezed and glued together in layers. It often looks layered and can contain fossils., Metamorphic Rock, Rock formed when an existing rock (igneous, sedimentary, or another metamorphic rock) is changed by intense heat and pressure deep inside the Earth. The rock is squeezed and baked but not melted., Rock Cycle, The endless process where Earth's materials are recycled, constantly changing one type of rock (igneous, sedimentary, or metamorphic) into another., Intrusive Igneous Rock, Igneous rock that forms inside the Earth. Because it cools slowly, it has large, easy-to-see crystals (like granite)., Extrusive Igneous Rock, Igneous rock that forms outside the Earth (on the surface) from lava. Because it cools quickly, it has very small or no visible crystals (like basalt or obsidian)., Foliated Metamorphic Rock, Metamorphic rock that has its mineral grains arranged in parallel bands or layers. This happens because of extreme pressure (like slate)., Nonfoliated Metamorphic Rock, Metamorphic rock that does not have layers or bands. This often happens when the change is caused mainly by heat (like marble)..

Rock Cycle

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