1. Layers of the Earth
Brown
Blue

2. Composition of the Earth
The Earth is divided into 3 layers:
Crust
Mantle
Core
The Crust and Mantle are made of less dense compound.
The Core is more dense that the crust and mantle.

3. CRUST The outermost layer 5-100 km thick Thinnest layer
2 types of crust
Continental- thick
Oceanic-thin

4. MANTLE 2900 km thick Between the crust and core Thick
Contains most of Earth’s mass
Scientists study the mantle by looking at the composition of magma.
Magma from volcanoes gives scientists clues about the composition of the mantle.

5. CORE Innermost layer Made mostly of iron and nickel Inner core solid
Outer core liquid
Core

6. Physical Properties of Earth
Earth divided into 5 physical layers:
Lithosphere
Asthenosphere
Mesosphere
Outer Core
Inner Core

7. Lithosphere Outermost layer of Earth Made of crust and upper mantle
Divided into pieces called tectonic plates.

8. Asthenosphere Layer below Lithosphere
Pieces of lithosphere (tectonic plates) move along this layer.
Made of solid rock, soft layer of the mantle
Solid that acts like a
liquid because of its
temperature

9. Mesosphere Below the asthenosphere Strong lower part of mantle
Extends to the Earth’s core

10. Outer Core
Liquid layer of Earth’s core
Surrounds inner core

11. Inner Core
Solid dense center

12. Quiz 1. Name the three main layers of the Earth.
2. Which layer is the most dense?
3. Which layer is the thinnest?
4. What are the two types of crust?
5. Which layer contains most of Earth’s mass?
6. What two layers make up the lithosphere?
7. The lithosphere is divided into pieces called:
8. Pieces of lithosphere move on top of this layer:
9. The Asthenosphere is said to be “plastic”. What does this mean?
10. Which layer, inner core or outer core, is liquid?
11. Which layer, the inner core or the outer core, is solid?

13. Answers 1.Crust, mantle and core 2. Core 3. Crust
4. Continental and oceanic
5. Mantle
6. Crust and upper mantle
7. Tectonic Plates
8. Asthenosphere
9. Because it is very hot and made of partially molten rock it bends and can be pushed and deformed due to the pressure placed on it from deep within the Earth.
10. Outer core
11. Inner core