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Rock Facts for MiniBooks 1. Rock Cycle Igneous rocks can change into metamorphic rocks from heat and pressure. The weathering of igneous rocks can lead to the formation of sedimentary rocks. Sedimentary rocks can change into metamorphic rocks from heat and pressure. The weathering of metamorphic rocks can lead to the formation of sedimentary rocks. Melting lava with metamorphic rock can cool and form igneous rocks. 2. Rock Families Sedimentary, Igneous, Metamorphic 3. Igneous Facts Rocks formed from when melted (molten) rock material cools and hardens. Magma may cool above or below the ground to form igneous rocks, sometimes called fire rocks Granite, Scoria, Pumice, Obsidian, Rhyolite, Basalt, Gabbro 4. Sedimentary Facts Rocks made from small bits of matter (bits of weathered rock, shells, or remains) that have been compacted or cemented together. They form in layers and often contain fossils. Sandstone, Limestone, Shale, Conglomerate, Bituminous Coal, Gypsum, Siltstone 5. Metamorphic Facts A rock formed from another kind of rock deep beneath the earth’s surface where it’s under intense heat and pressure. These “morphed” rocks are noted for their flattened grains. Schist, Gneiss, Slate, Quartzite, Marble