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Unit 1: Sixth Grade. SEDIMENTARY ROCKS. How sedimentary rocks form… . Wind, water, ice, sunlight, and gravity cause rocks to weather into sediments. These sediments are moved from one location to another by the process of erosion.

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Unit 1 sixth grade

Unit 1: Sixth Grade

SEDIMENTARY ROCKS


How sedimentary rocks form
How sedimentary rocks form…

  • Wind, water, ice, sunlight, and gravity cause rocks to weather into sediments.

  • These sediments are moved from one location to another by the process of erosion.

  • Erosion: The movement of the material from one place to another


Formation of sedimentary rocks
Formation of Sedimentary Rocks

  • The sediments are eventually deposited on to older layers and form new ones.

  • The sediments become compacted and dissolved minerals separate from water and form a natural cement—Lithification.

  • Sedimentary rocks are formed


Strata and stratification
Strata and stratification

  • STRATA

    • Layers of rock

    • STRATIFICATION

    • process in which sedimentary rocks are arranged in layers


How are were the stripes formed
How are were the stripes formed?

  • Wind blew over thousands of years

  • Carried mineral/rock fragments, “sand” to ocean floors, lakes rivers

  • The sand mixes with quartz or calcite.

  • Pressure over time causes them to become rock


How are the stripes formed
How are the Stripes Formed?

  • But not all sand is the same!

  • Over millions of years, smaller grains separated from the larger grains and were layered on the bottome


Petra
Petra

  • Why do you think there are so many colors in the stone?

  • Can you describe the pattern on this structure?

  • Does this structure support the idea that layers of sediments piled on top of each other and exposed to heat and pressure form sedimentary rock?


Organic sedimentary rocks
Organic sedimentary rocks

  • Form from remains or fossils of once living things.

  • EXAMPLE: limestone, coal

  • COAL----

    • Forms underground when partially decomposed plant material is buried beneath sediment and is changed into coal the pressure from layers above.

    • This process takes millions for years.

    • Non-renewable fossil fuel


Clastic sedimentary rocks
Clastic sedimentary rocks

  • Made from fragments (sediments) of rocks that are cemented together by minerals .

  • They are classified according to the size of the fragments.

  • EXAMPLES: conglomerate, sandstone, siltstone, shale


Loose sediments

Clastic Sedimentary Rock


Chemical sedimentary rocks
Chemical sedimentary rocks

  • Form from solutions of dissolved minerals and water.

  • EXAMPLE: halite


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