rocks the life of a rock sedimentary rock metamorphic igneous changes are made from pressure and...
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Rocks
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The Life of a Rock
Sedimentary Rock
Metamorphic
Igneous
Changes are made from pressure and heat.
Layers of sediment join together.
Melted rock cools and hardens
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Rocks become smaller, and smaller, and smaller, and smaller. . .
• By erosion• By wind• By earthquake• By floods• By rain• By slides• By man
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Terms to Know
• Weathering: the breaking up of rocks and soil
• Erosion: the moving of weathered rock and soil. Weathering allows erosion to take place.
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Products of Weathering
• Clay
• Sand
• Rock Fragments (pebbles and stones)
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Rocks change…………..
• By earthquakes• By volcanoes• By heat and pressure
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Sedimentary Rock is . . .
• Rock formed when layers of small particles of shell, rock, and sand join together.
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Sedimentary RocksHow They are Made
• Wind and water break down the earth• Bits of earth settle in lakes and rivers• Layers are formed and build up• Pressure and time turn the layers to rock
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Types of Sedimentary Rocks
Gypsum
Sandstone
Shale
Limestone
Conglomerate
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Fossils
• Fossils are usually found in sedimentary rock and are the remains or imprints of plants and animals that died long ago.
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Fossils-Life From the Past
• Fossils provide information about life and conditions of the past.
• Scientific evidence shows that the Earth is approximately 4.5 billion years old
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Metamorphic Rock is . . .
• Rock that is formed when pressure and heat create changes to sedimentary or igneous rock.
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Metamorphic RocksWhat are They?
• Rocks that have changed
• They were once igneous or sedimentary
• Pressure and heat changed the rocks
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Types of Metamorphic Rocks
Schist Gneiss
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Igneous Rock is . . .
• Rock that is formed when melted rock cools and hardens.
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Igneous RocksWhat are They?
• Fire Rocks
• Formed underground by trapped, cooled magma
• Formed above ground when volcanoes erupt and magma cools
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Types of Igneous RocksGranite Scoria
Pumice Obsidian
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Review of the Rock Cycle
• How are sedimentary rocks formed?
• What is a fossil?
• How are metamorphic rocks formed?
• How are igneous rocks formed?
• Give an example of each type of rock.
• What is weathering?
• Explain what erosion is.
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Credits
• These slides were a compilation of work by:
• Jefferson County Schools Power Points on Rocks
• http://jc-schools.net/PPTs-science.html
• Ellen Benegar (Suffolk Public Schools)