1. Earth layers

2. Earth layers

3. Earth’s Layers
The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed.
This crust is not a solid shell; it is broken up into huge, thick plates that drift atop the soft, underlying mantle.

4. Thickness of the layers

5. The Core Below the mantle and to the center of the Earth
Believed to be mostly Iron, smaller amounts of Nickel, almost no Oxygen, Silicon, Aluminum, or Magnesium

6. Inner core
Mostly solid iron
Hottest
Most pressure
Innermost layer

7. Outer core
Above the inner core
Liquid molten metal

8. The Mantle Layer of Earth between the crust and the core
Contains most of the Earth’s mass
Has more magnesium and less aluminum and silicon than the crust
Is denser than the crust

9. Mantle Largest layer Solid, but flows slowly like putty
Contains the most mass
Upper mantle part of lithosphere
Lower upper mantle is part of asthenosphere

10. Crust Thinnest layer Outermost layer Coolest temp Least pressure
2 types- continental crust (land) thickest
Oceanic crust (located under ocean) thinnest

11. Earth layers Infer from the graphs about the Earth below, what happens as the depth increases?

12. The deeper inside Earth, the higher the temperature and pressure.

13. http://www. livescience

14. Earth layers

15. Tectonic Plates

16. Plate Tectonics Greek – “tektonikos” of a builder
Pieces of the lithosphere that move around
Each plate has a name
Fit together like jigsaw puzzles
Float on top of mantle similar to ice cubes in a bowl of water

17. Continental Drift Alfred Wegener 1900’s
Continents were once a single land mass that drifted apart.
Fossils of the same plants and animals are found on different continents
Called this supercontinent Pangea, Greek for “all Earth”
245 Million years ago
Split again – Laurasia & Gondwana 180 million years ago

18. Evidence of Pangea

19. Lithosphere vs. asthenosphere

20. Lithosphere vs. asthenosphere
What is the lithosphere?
crust and uppermost mantle
broken into 30 plates
What is the asthenosphere?
plastic-like part of mantle under the lithosphere
plates (lithosphere) move around on this

21. Lithosphere vs. asthenosphere

22. Lithosphere vs. asthenosphere

23. Plate tectonics BrainPOP “Plate tectonics”