warm up 1.the igneous rock texture that is characterized by two distinctly different crystal sizes...
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Warm UpWarm Up1. The igneous rock texture that is characterized by two
distinctly different crystal sizes is called ____.a. porphyritic texture c. fine-grained textureb. glassy texture d. coarse-grained texture
2. Igneous rocks that crystallize from magma and are composed almost entirely of quartz and feldspars have a(n) ____.a. andesitic composition c. ultramafic compositionb. basaltic composition d. granitic composition
3. A rock that forms when magma hardens beneath Earth’s surface is called an ____.a. intrusive metamorphic rockb. extrusive igneous rockc. intrusive igneous rockd. extrusive sedimentary rock
Answers: 1) a. 2) d. 3) c.
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Sedimentary RocksSedimentary Rocks
Chapter 3, Section 3Chapter 3, Section 3
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Weathering, Erosion, and DepositionWeathering, Erosion, and Deposition
• Weathering is any process which breaks rocks into sediments
• Erosion involves weathering and the removal of rock. When an agent of erosion – water, wind, or gravity – loses energy, it drops the sediments. This process is called deposition.
• Sediments are deposited according to size.
• Smaller sediments will travel longer distances
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Weathering, Erosion, and Weathering, Erosion, and DepositionDeposition
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Compaction and CementationCompaction and Cementation
• Compaction and cementation change sediments into sedimentary rocks
• Compaction is a process that squeezes, or compacts, sediments
• Compaction is caused by the weight of sediments
• Cementation takes place when dissolved minerals are deposited in the tiny spaces among the sediments.
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Compaction and CementationCompaction and Cementation
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Concept CheckConcept Check
• What are the five major processes involved in the formation of sedimentary rocks?
• Weathering, erosion, deposition, compaction, and cementation
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Classification of Sedimentary Classification of Sedimentary RocksRocks
• Just like igneous rocks, sedimentary rocks can be classified into two main groups according to the way they form.
• Clastic Sedimentary Rocks – rocks that are made of the weathered bits of rocks and minerals
• Chemical Sedimentary Rocks – forms when dissolved minerals precipitate from water solutions
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Clastic vs. Chemical Sedimentary Clastic vs. Chemical Sedimentary RocksRocks
Clastic Sedimentary Rocks
Chemical Sedimentary Rocks
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Formation of Formation of CoalCoal
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Concept CheckConcept Check
• What are the major types of clastic sedimentary rocks?
• Conglomerates and breccia, sandstone, shale and siltstone
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Sedimentary Rock FeaturesSedimentary Rock Features
• The many unique features of sedimentary rocks are a clue to how, when, and where the rocks formed.
• Each layer of sedimentary rocks records a period of sedimentation
• The oldest layers are found at the bottom and the youngest layers are found at the top
• Some fossils are unique to certain sedimentary rocks; they can answer questions as to where that rock formed and how old they are
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Sedimentary Rock FeaturesSedimentary Rock Features
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AssignmentAssignment
• Read Chapter 3, Section 3 (pg. 75-79)
• Do Chapter 3 Assessment #1-36 (pg. 89-90)
• For Section 3: Do #’s 6-8, 15, 16, 24, 25, 29, 30, 31, 32