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Published byHugo Morris Modified over 9 years ago
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The Geologic Record and the Environment
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Geologic Time Evidence suggests Earth is approximately 4.6 billion years old! Earth’s history is divided into sections based on… ◦Climate ◦Earth’s surface ◦Living Organisms
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Uniformitarianism Processes that occur on Earth’s surface today have occurred for 4.6 billion years. ◦Weathering ◦Erosion
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◦Deposition ◦Tectonic plate activity ◦Volcanoes ◦Folding ◦Faulting ◦Continental drift
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Evidence of Past Environments Ripples found in rocks. ◦Moving water Basalt or Granite (igneous rocks) ◦Volcanoes
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Mud and Shale ◦Lake, swamp, or other small body of water Sand or Sandstone ◦Desert or Ocean
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Evidence of Past Climates Rocks ◦Till rocks left by glaciers. ◦Rocks with iron (red) formed in deserts. ◦Salt in rocks from evaporated oceans.
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Fossils ◦Animals with adaptations to warm/cold climates. ◦Woolly mammoth and coral reef.
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Landscape ◦Glacier erosion ◦Glacier deposition
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Ice cores ◦Temperature (water isotopes) ◦Atmosphere composition (amount of CO2) ◦Precipitation ◦Volcanic eruptions ◦Ocean size ◦Deserts ◦Forest fires
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Global Warming The average global temperature has increased over 1 degree F in 100 years. The amount of CO2 (greenhouse gas) has increased very fast!
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Evidence for Global Warming Average global temperature Sea level rising Shrinking ice caps Warmer oceans Fewer glaciers
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Why is this bad?
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