The document describes the four main layers of the Earth from outermost to innermost: 1) the crust, made of rocks and soil, is the thinnest layer; 2) the thick, flexible mantle below is made of magma; 3) the outer core of melted nickel and iron; and 4) the inner core is solid iron, nickel, and alloy and experiences extreme pressure.

1. Layers of the Earth

3. 1. Crust
- Earth’s outermost layer
- Made up of soil and rocks
- Thinnest among the other
layers
- 3-80 km thick
- 870 Celsius

4. 2. Mantle
- Thickest layer of the Earth
- Made up of magma
- 3000 km thick
- Flexible (plastic layer)
- 1600-4000 Celsius

5. 3. Outer Core
-Composed of melted Ni
and Fe
-2890 km thick
-4400 Celsius

6. 4. Inner Core
- Composed of solid Fe, Ni,
Alloy
- 1222 km thick
- 4400 Celsius
- Metals are squeezed
together (pressure)

7. Review for
10 minutes

8. 1. Earth’s outermost layer
2. Composed of solid Fe, Ni,
Alloy
3. Thickest layer of the Earth
4. Composed of melted Ni and Fe
5. Metals are squeezed
together

9. 6. Thinnest among the other
layers
7. Flexible (plastic layer)
8. Made up of soil and rocks
9. Made up of magma
10. Composed of Lithosphere
and Asthenosphere

10. Bonus (5 points)
Draw and label
the layers of the
Earth