1. 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

2. Evidence from
Rock Samples
Rocks are gathered from:
Drilling
Volcanoes

3. 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

4. Three Main Layers of Earth’s Interior
Core
Mantle

5. Each Layer of Earth’s Interior
Each layer of Earth’s interior varies greatly in:
Size
Composition
Temperature
Pressure

6. Layer Sizing of Earth’s Interior

7. Pressure in Earth’s Interior
Pressure results from a force pressing on an area. The deeper down inside Earth, the greater the pressure.

8. 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.

9. Earth’s Interior: The Crust
Oceanic Crust = Basalt Continental Crust = Granite