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How Do Geologists Learn About Earth’s Interior?
Geologists have used two main types of evidence to learn about Earth’s interior: Direct Evidence: from rock samples Indirect Evidence: from seismic waves
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Evidence from Rock Samples Rocks are gathered from: Drilling Volcanoes
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Evidence from Seismic Waves
Indirect Method of Gathering Evidence of Earth’s Interior. Timing of seismic wave provide information about Earth’s interior. Strength of seismic wave provide information about Earth’s interior
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Three Main Layers of Earth’s Interior
Core Mantle
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Each Layer of Earth’s Interior
Each layer of Earth’s interior varies greatly in: Size Composition Temperature Pressure
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Layer Sizing of Earth’s Interior
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Pressure in Earth’s Interior
Pressure results from a force pressing on an area. The deeper down inside Earth, the greater the pressure.
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Pressure & Temperature in
Earth’s Interior Pressure results from a force pressing on an area. The deeper down inside Earth, the greater the pressure and temperature.
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Earth’s Interior: The Crust
Oceanic Crust = Basalt Continental Crust = Granite
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