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Coach Williams Room 310B.  Formation of Sedimentary Rocks.

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Presentation on theme: "Coach Williams Room 310B.  Formation of Sedimentary Rocks."— Presentation transcript:

1 Coach Williams Room 310B

2  Formation of Sedimentary Rocks

3  Formed by cemented sediments

4  Solid material  Deposited on Earth’s surface  Wind, water, ice, gravity, chemical precipitation  Form sedimentary rocks

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6  Earth’s crust is worn down  Physical or chemical processes  Clastic sediments- rock or mineral fragments ◦ Greek klastos = broken

7  Removal and movement of rock fragments  4 Main ways: ◦ Wind ◦ Moving water ◦ Gravity ◦ Glaciers  Deposition- sediments laid down ◦ Land and water 

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9  Sediments become rock  Greek lithos = rock  Layers of sediment = pressure  Deep layers = hot temperature  Cementation- mineral growth cements sediment together

10  Bedding- horizontal layering  Graded Bedding- larger/heavier fragments at bottom layers  Cross-Bedding- layer crossing over another one

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12  Preserved evidence of once-living organisms ◦ Remains or impressions  Found in sedimentary rocks

13  Types of Sedimentary Rocks

14  Clastic- deposited loose fragments  Chemical- dissolved minerals left behind

15  Classified by sediment size  Coarse-grained: gravel-sized fragments  Medium-grained: sand-sized fragments  Fine-grained: silt-sized fragments  Porosity- % of open spaces

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17  Evaporation- leaves minerals behind ◦ Evaporites: rocks formed this way  Organic- remains of once-living organisms ◦ Shells, bones ◦ Coal- remains of plant material; carbon; fuel

18  Energy- coal, natural gas, oil, nuclear  Fertilizers  Iron  Walls/buildings  Snapshot- cross bedding & fossils

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20  Metamorphic Rocks

21  Temperature/pressure changes rocks ◦ Composition, minerals, texture  Meta = change Morph = form

22  Regional: large regions  Contact: molten rock touches solid rock  Hydrothermal: hot water alters rock

23  Foliated: minerals are wavy layers/bands  Non-foliated: no mineral grains in one directions

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25  Changing and re-making of rocks

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