Sedimentary Rocks and Fossils

Explore the process that led to sedimentary rock formation

Vocabulary Words

  • Sediment
  • Compaction(pressure)
  • Cementation(glue)
  • weathering
  • erosion
  • deposition
  • process
  • fossil

Step 1

Rock is broken down into sediments by WEATHERING
Over the course of millions of years, rocks are weathered down by forces of wind, water and ice. Fine particles of rock begin to cover the landscape. These little bits of rock and sand are called sediments.
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Step 2

Wind and water carry the sediment downstream by EROSION
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Step 3

sediment ends up being trapped in water, and eventually falls/settles (DEPOSITION) to the bottom of lakes, streams, and oceans.

The layers of sediment on the bottom of lakes, and especially on the bottom of the ocean grows deeper and deeper, reaching depths of thousands of feet. Over many years, the rock bits settle into different layers.

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Step 4

The weight of the layers has great pressure causing the loose sediment to compact
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Step 5

This compacted sediment at the bottom of the lake or ocean is exposed to dissolved minerals in the water, these minerals work to cement(or glue) the material together, this is known as CEMENTATION


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Fossil Rock Anthem


are the remains or impressions of left by organisms living a very long time ago
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Fossil Layer Questions

1.What observations can you make from the above fossil picture?

2. What occurs to the organic material that is trapped in the sedimentary rock? Is a fossil the actual remains of the plant or animal? What does it become? How do you think this happens?

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Brain Pop - Fossils

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