1. Earth's Energy Sources

2. A] Internal sources (from inside Earth)
1] GRAVITY

3. Holds down atmosphere

4. Recycles surface of land (subduction zone)

5. Pulls down rain—no water cycle without gravity

6. GRAVITY ALSO CREATES HEAT INTERNALLY

7. 2] RADIATION- from the core due to decaying atoms-makes heat

8. This internal heat comes to the surface, but more importantly keeps the core melted which…

9. Allows us to have a magnetosphere—a force field around earth

10. Without a magnetic field, the solar wind would blow off the atmosphere and life would end

11. B] External sources

12. 1] SOLAR--Warms us and provides energy for all plants to exist—thus all life

13. 2] GRAVITY—of moon– creates tides

14. The Moon also keeps the Earth at a 23
The Moon also keeps the Earth at a 23.5 degree tilt– causing a majority of the landmasses to be able to produce food thus sustain life

15. Summary INTERNAL ENERGY SOURCES EXTERNAL ENERGY SOURCES
Radioactive decay
Gravity
EXTERNAL ENERGY SOURCES
Sun
Gravity of moon