1. Inside the Earth

2. Composition (What it is made of)
Crust
Mantle
Core

3. The Crust Outer layer 5-100 km thick 2 types of crust
Oceanic (very dense, made of basalt)
Continental (less dense, made of granite)

4. Oceanic and Continental Crust

5. Layers of Earth
Crust
Basalt: Ocean crust made of dark dense rock and is very thin
Granite: Continental crust that is less dense but is thicker (especially where mountains are present)
Oceanic Crust
Continental Crust
2-3 miles thick
Basalt
More dense
20-35 miles thick
Granite
Less dense

6. The Mantle
Middle layer
Very thick layer
3,000 km thick

7. Layers of Earth
Mantle
Lithosphere: upper most part of the mantle and lower part of the crust
About 100 kilometers thick
Solid and broken up into plates by cracks
Lithosphere

8. Layers of Earth
Mantle
The temperature and pressure in the mantle increases with depth
The increasing pressure and high temperature cause the lower part of the mantle (asthenosphere) to be soft and gives it the ability to flow easily (plasticity)

9. Layers of Earth
Mantle
Asthenosphere: Lower, plasticity part of the mantle that flows easily
The core heats this section of the earth, and causes convection current to flow here
Asthenosphere

10. The Core
Made mostly of iron
1/3 of the earth’s mass
Very hot

11. Earth’s Layers How are the earth’s layers similar to an egg?
Shell=crust
Egg white=mantle
Yolk=core

12. Layers of Earth Core Outer core: thick liquid, molten material
Inner core: dense ball of solid metal (iron and nickel)

13. Physical Structure of the Earth (5 Layers)
Lithosphere- rigid outer layer (crust)
Asthenosphere- solid rock that flows slowly (like hot asphalt)
Mesosphere- middle layer
Outer Core- liquid layer
Inner Core- solid, very dense

14. Tectonic Plates Earth’s crust is broken into about 19 pieces
These plates move on top of the asthenosphere