Identifying Rocks
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Transcript of Identifying Rocks
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Identifying Rocks
Sedimentary rocks
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• Rocks are partly identified by origin:• Igneous
• Sedimentary• Metamorphic
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Sedimentary Rocks
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Wow!
• Seventy percent of all the rocks on earth are sedimentary rocks.
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How are sedimentary rocks formed?
• Several Steps
• Erosion• Deposition• Compaction• Cementation
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Erosion/Weathering• Occurs when running water or wind loosens
and carries away fragments of rocks.
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Erosion
• Erosion is the breakdown of the continents and the land around you.
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Erosion is destructive!!!
What causes erosion?• Wind, water, heat, cold, rain, waves, grinding
ice
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• Boulders become sand. Mountains are rained on and become hills. The pieces of the mountain become smaller pieces and go down the sides of hills. Weathering and erosion always happen in a downhill direction.
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Fire Island Erosion
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Erosion
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2. Deposition
When the sediments settle out of the wind or water.The Sediment will sink to bottom of lake or ocean
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The sediments are deposited into a body of water like you are depositing
money in a bank
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Deposition
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Compaction
• It is a process• Thick layers of sediment build up• Layers become heavy and press down on
layers beneath• Sediments are pressed together
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Compaction
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Compaction Diagram
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3. Cementation
• Word connection- cement– First Minerals in rock dissolve– Next, cement seeps into spaces between particles– Then, dissolved minerals crystallize and GLUE the
particles together
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See the cement? See the large pebbles?
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Compaction and Cementation
• These processes cause loose sediments to turn into rocks
• This takes millions of years!!!!
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es0604/es0604page01.cfm?chapter_no=visualization
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• grains of different sizes settle under the action of gravity. • adding the pressure causes compaction (center). • Cementation (right) is one of the final processes that turns sediment into
rock.
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Types of Sedimentary RocksClastic- formed by rock fragments squeezed together
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Conglomerate
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• Conglomerate is a sedimentary rock • contains rounded particles/pebbles that are
cemented together• Has a large range of particle sizes
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Organic
• made from living things (coral, clams, oysters, snails, shells, skeletons, leaves)– Coal– Limestone(chalk)
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Organic Sedimentary Rock with Fossils
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Plant fossils
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Chemical
• when minerals dissolve in a solution and crystallize
• Calcite to limestone• Halite to mineral salt• gypsum
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In September, 2012, NASA's Mars rover Curiosity discovered an outcrop of conglomerate exposed on the surface of Mars
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Martian Conglomerate: This image was acquired by NASA's Curiosity rover on the surface of Mars. It shows an outcrop of conglomerate and some pebble-size
weathering debris. The round pebbles are too large to have been moved and shaped by wind, thus they had to have been transported a significant distance by water. This photo from September 2012 was the strongest evidence of the
existence of water on Mars that had been obtained at that time.
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