1. Earth’s Interior

2. Geologists examine the layers of Earth to answer what three questions?
How old is Earth?
How has Earth’s surface changed over time?
Why are there oceans, and how did they form?

3. Geologists divide the forces that change the earth’s surface into two groups:
Constructive forces
Examples?
Destructive forces

4. Evidence of Earth’s Interior
Direct- drilling for rock samples
Indirect- Seismic waves
Primary waves-fastest ->Longitudinal movement
Secondary waves-> traverse movement
Surface waves-most destructive-

5. Seismic Activity Today

6. Temperature Near the surface would be cool
20 meters down the rock gets warmer
For every 40 meters that descends a temperature increases 1°C

7. Pressure
The pressure increases as you go deeper inside the earth because amount and weight of the rock increases

8. The crust The mantle Lithosphere Asthenosphere The core Earth’s layers
The three main layers make up Earth’s interior:
The crust
The mantle
Lithosphere
Asthenosphere
The core

10. Crust Outer layer of earth Consist of oceanic and continental crust
Oceanic is made of basalt-a dense, dark, fine coursed rock.
Continental is made of granite.

11. Mantle Largest part of earth’s makeup
Consist of lithosphere and Asthenosphere
Lithosphere: The upper most mantle and the crust form a solid rigid
Asthenosphere: The soft portion of the mantle in which the lithosphere floats

12. Inner core – dense iron and nickel, solid ball
Outer core- molten iron and nickel
Shields earth from harmful radiation from the sun.

13. Thank You Core!!!