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Rocks - PowerPoint PPT Presentation

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Rocks
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  1. Rocks

  2. The Life of a Rock Layers of sediment join together. Changes are made from pressure and heat. Melted rock cools and hardens

  3. Rocks become smaller, and smaller, and smaller, and smaller. . . • By erosion • By wind • By earthquake • By floods • By rain • By slides • By man

  4. 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.

  5. Products of Weathering • Clay • Sand • Rock Fragments (pebbles and stones)

  6. Rocks change………….. • By earthquakes • By volcanoes • By heat and pressure

  7. Sedimentary Rock is . . . • Rock formed when layers of small particles of shell, rock, and sand join together.

  8. 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

  9. Sandstone Limestone Gypsum Conglomerate Shale Types of Sedimentary Rocks

  10. Fossils • Fossils are usually found in sedimentary rock and are the remains or imprints of plants and animals that died long ago.

  11. 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

  12. Metamorphic Rock is . . . • Rock that is formed when pressure and heat create changes to sedimentary or igneous rock.

  13. Metamorphic RocksWhat are They? • Rocks that have changed • They were once igneous or sedimentary • Pressure and heat changed the rocks

  14. Schist Gneiss Types of Metamorphic Rocks

  15. Igneous Rock is . . . • Rock that is formed when melted rock cools and hardens.

  16. Igneous RocksWhat are They? • Fire Rocks • Formed underground by trapped, cooled magma • Formed above ground when volcanoes erupt and magma cools

  17. Scoria Granite Pumice Obsidian Types of Igneous Rocks

  18. 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.

  19. 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)