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Types of Rocks Igneous- the type of rock that forms From melted material Sedimentary- the type of rock that forms As pieces or sediments press together Metamorphic- the type of rock that forms From changes to other rocks (Starting text page 74) The Rock Cycle Rock Material The earth’s crust or litohsphere is made of rocky material. Rocks are made of minerals that are pressed together Geologists observe the color and texture of rocks to determine their composition or make up. (See text page 76) Words to know… Igneous Metamorphic Sedimentary Sediments Intrusive igneous rock Extrusive igneous rock Fine grained Coarse grained Grain pattern Conglomerate