1. Round from pull of gravity over time
Size & Shape
About 24,000 miles around
Radius 6400 km
Round from pull of gravity over time
Any object larger than 700 km will become a circle

2. Composition
Crust: ____ & ______
Mantle: _______ (Magnesium, Iron, Silicon)
Liquid Core & Solid Core
_____________

3. Separation of materials by density is Seismic Waves (_________)
How can we tell?
Density
Separation of materials by density is
Seismic Waves (_________)

4. P waves __________ travel in _____________
S waves _______waves only travel through _________

5. Heat
2 theories
Earth began hot and attracted more mass and gained heat from the ________
Generated heat from _______________

6. Age of Earth
4.5 billion years

7. _________- heated matter expands and rise
Heat causes motion
_________- heated matter expands and rise
________ – stretching and spreading of crust
_________- one plate slides under another

8. 1912 ________________________
Alfred Wegener
1912 ________________________
__________________
All continents began together
Evidence: ______________

9. 2 theories ________ collisions ________ explosions
Atmosphere
2 theories
________ collisions
________ explosions

10. Atmosphere protection
_______ (O3) block UV radiation
________- trapped heat from the Sun

11. __________ Effect from currents in molten core protects us from charged particles from the Sun ________- belts of trapped radiation

12. Coriolis Effect/ Magnetism