1. 9/14/10 BR: If I were to start digging and went straight through the Earth where would I end up? What problems might I have if I tried this? Today:The Earth’s Layers, Axis, Plate Tectonics -Personal Folder -MIKVA - “A” Essay Due Wednesday

2. Daily Notes 9/14/10 - Earth Layers Earth Stats Earth Orbit/Axis/Seasons Summary: Questions:

3. Earth’s Layers The Earth is made of 3 layers- crust, mantle, and core The circumference of the earth at the equator is 24,901.55 miles The earth through the poles the circumference is a bit shorter - 24,859.82 miles Equatorial bulge caused by Earth’s spin and sun/moon’s gravity

8. Earth Stats 93 million miles from sun While we're hurtling through space at nearly 67,000 mph, we're also spinning around in circles at over 1000 mph! The Sun is a fusion nuclear reaction- it powers the whole system The Earth’s magnetosphere protects us from the sun’s deadly radiation

12. Earth Orbit It takes the Earth 1 year to go around the sun. The path the Earth takes around the sun is called the Earth’s “Orbit.”

13. Earth’s Axis - Earth is divided into hemispheres- equator divides N & S, while Prime Meridian divides E&W.

14. Earth’s Axis- 23.5° - causes seasons- the uneven distribution of heat causes ocean currents and the weather