Rock Types

Learn to identify igneous, sedimentary, and metamorphic rocks!

Match the terms with the Definition Rocks Hard collection of minerals bound together - form Earth’s crust Igneous Rocks Rocks formed from molten rock either on Earth’s surface or underground Intrusive Igneous Rocks Formed underground when magma slows slowly - have big visible crystals which create a coarse texture Extrusive Igneous Rocks Formed on the surface of Earth when lava cools quickly - small, tiny crystals which create a fine texture Sedimentary Rock Formed from pieces of weathered rocks are cemented together or when minerals are left behind when water evaporates Metamorphic Rock Formed underground when other rocks are exposed to heat and pressure Sorting Read each statement or rock type. Use your notes to determine if it should be classified under igneous, sedimentary or metamorphic. Igneous Can be intrusive or extrusive Formed from molten rock Granite Gabbro Diorite Pegmatite Has crystals Basalt Pumice Obsidian Scoria Sedimentary Sediments of weathered rock cemented together Minerals left behind when water evaporates Often have visible layers Sandstone Conglomerate Limestone Coal Metamorphic Formed underground when other rocks are exposed to heat and pressure Visible minerals are stretched and squished May be in layers but they aren’t even and flat Slate Marble Schist Gneiss