earth’s rocks
Post on 20-Feb-2016
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Earth’s Rocks
What are rocks?
• Rock – any naturally formed solid in the crust made up of 1 or more minerals
• May have a mixture of properties• Identification– Name the minerals it contains– Color– Density– Texture – based on how they were formed
Igneous Rocks
• Form when melted rock material cools and hardens
• Lava can also cool to form igneous rocks• Used in monuments• Obsidian – solid piece of volcanic glass• Ex. Obsidian, basalt, granite, gabbro
Uses for Igneous Rock
Gravestones
Buildings
Countertops
Tools
Sedimentary Rocks
• Made of small bits of matter joined together– Weathered rocks, shells, remains of living things
• Formed when sediment is compacted or cemented together
• Ex. Shale, siltstone, sandstone, conglomerate, limestone, conquina, bituminous (coal)
Uses for Sedimentary Rock
• Buildings• Monuments• Park Benches• Cement and concrete• Contain fossils or remains of living things of
the past• Almost all fossils are found in sedimentary rock• Energy
Metamorphic Rocks
• A rock formed under heat and pressure from another kind of rock
• The original rock stays solid• They have new useful properties• Slate is used in roofing shingles• Marble for countertops, floors, and statues• Anthracite is a form of hard coal
Uses for Metamorphic Rock
Buildings
Countertops
Roofing shingles
Energy
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