1. Inside the Earth
The Geosphere

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

3. The Crust Outer layer 1% of Earth’s mass 5-100 km thick (2 – 25 miles)
Equal to a piece of paper on a basketball
871 C (1600˚ F)
2 types of crust
Oceanic (very dense, made of basalt)
Continental (less dense, made of granite)

4. Oceanic and Continental Crust

5. The Mantle Middle layer 2880 km thick layer (1800 mi)
Up to 4426 C (8000 ˚ F)

6. The Core Made mostly of iron and nickel 1/3 of the earth’s mass
Outer core
2240 km thick (1400 mi)
6093 C (11,000 ˚ F)
Movement is source of Earth’s magnetic field
Inner core
solid
1280 km thick (800 mi)
7204 C (13,000 ˚ F)
1/3 of the earth’s mass

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

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

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