1. EARTH SCIENCE

2. What to expect  Earth  Its layers  How they behave  How new mantel is created

3. Layers  2 types  Compositional  Mechanical

4. Compositional  Crust  Mantel  Core

5. Crust  Low density  Between 5-70 km thick  2 different types of crust  Continental Under continents Varies in composition Varies in thickness  Oceanic Under oceans Usually thinner (5-6 km) Mafic Uniform

6. Mantel  High density  Ultramafic silicate rock  Over 2900 km thick and makes up over 80% of the volume of the Earth.  The mantle is not molten!

7. Core  Iron and nickel  Liquid outer region  Solid center  The core is just over half the diameter of the Earth.

8. IMPORTANT  These compositional layers have sharp or abrupt boundaries between them.

9. Mechanical layers  Lithosphere  Asthenosphere  Mesosphere (lower mantel)  Outer core  Inner core

10. Lithosphere  Most ridged layer of the earth  About 100 km thick  Really thin in mid ocean ridges  Thicker under continents

11. Asthenosphere  Plastic (kind of solid but it moves)  About 100 km thick

12. Mesosphere  Ridged (still can move, but less than asthenosphere)  Takes up the rest of the mantel

13. Outer core  Liquid  Mostly iron and some other elements  Actually a liquid (ONLY LAYER THAT IS TRUELLY A LIQUID)  10-12 km thick

14. Inner core  Ridged/solid  Same composition as the outer core, just in solid form  About ½ the size of the overall core  12-13 km thick