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IGNEOUS *Form from magma cooling inside earth or lava cooling outside the earth. *Extrusive- formed outside from lava. Small or no crystals present. *Intrusive- formed inside from magma. Larger crystals. *The longer the cooling time the larger the crystals will form. *Hard, dense and durable being used for building. *Comes from latin word “ignis” which means fire. *Make up majority 65% of Earth’s crust. *Common rocks: granite, basalt, obsidian, pumice SEDIMENTARY *Form when rocks weather, erode, deposit, compact and cement together. *Have thicker layers that are loosely compacted. *Often dull in luster and can break easily. *Can have fossils in them. *Clastic- made of rock fragments / sediment. *Organic- made of remains of plants and animals *Chemical- made from dissolved minerals that form a solution which crystallizes as the water evaporates. *Make up a very small 8% of Earth’s crust. *Common rocks: sandstone, shale, conglomerate, limestone, calcite, coal METAMORPHIC *Form when rocks are exposed to intense heat and pressure. *Have thinner layers that can be foliated (wrinkled). *Often shiny, very hard and dense. *Make up 27% of Earth’s crust. *Comes from Greek words “meta” meaning change and “morpho” meaning form. *Common rocks: marble, slate, quartzite, schist and gneiss (pronounced nice). IGNEOUS *Form from magma cooling inside earth or lava cooling outside the earth. *Extrusive- formed outside from lava. Small or no crystals present. *Intrusive- formed inside from magma. Larger crystals. *The longer the cooling time the larger the crystals will form. *Hard, dense and durable being used for building. *Comes from latin word “ignis” which means fire. *Make up majority 65% of Earth’s crust. *Common rocks: granite, basalt, obsidian, pumice SEDIMENTARY *Form when rocks weather, erode, deposit, compact and cement together. *Have thicker layers that are loosely compacted. *Often dull in luster and can break easily. *Can have fossils in them. *Clastic- made of rock fragments / sediment. *Organic- made of remains of plants and animals *Chemical- made from dissolved minerals that form a solution which crystallizes as the water evaporates. *Make up a very small 8% of Earth’s crust. *Common rocks: sandstone, shale, conglomerate, limestone, calcite, coal METAMORPHIC *Form when rocks are exposed to intense heat and pressure. *Have thinner layers that can be foliated (wrinkled). *Often shiny, very hard and dense. *Make up 27% of Earth’s crust. *Comes from Greek words “meta” meaning change and “morpho” meaning form. *Common rocks: marble, slate, quartzite, schist and gneiss (pronounced nice).