3 BASIC LAYER OF THE EARTH

1. Earth’s
Layers

2. Earth is divided into 3
basic layers:
1. Crust
2. Mantle
3. Core
These layers are then
subdivided into smaller layers.

3. CRUST:
•Is the outermost layer on the earth.
(EGG SHELL)
•Thickness varies. Under mountains
it can be as thick as 60 km and less
than 5 km under the ocean.
•It is the least dense of all the layers.
(lightest layer)
•It is made up of silicon and oxygen.

4. • Oceanic crust is
very dense, made
of Basalt.
• Continental crust
is less dense,
made of Granite.
2 TYPES OF CRUST:

5. BASALT
GRANITE

6. MANTLE
• Located below the crust.
(Egg White)
• It is the largest layer
(about 2900 km thick).

7. MANTLE: Divided into 2 parts
• Upper mantle
• Lower mantle
• Contains the “Moho”
(Mohorovicic discontinunity)

8. CORE
Located below the Mantle. (Egg
Yolk)
• It is divided into 2 layers
Outer Core
Inner Core

9. Outer Core
• is liquid and is made up of mostly
iron (easily magnetized)

10. Inner Core
• Is the center of the Earth – 1200
km thick.
• It’s solid iron and nickel. Most
dense layer (heaviest)

11. Identify the basic layers of the Earth
1.
2.
3.
4.

12. Identify the basic layers of the Earth
1. CRUST
2. MANTLE
3. OUTER CORE
4.INNER CORE

13. Draw the three
basic layer of the
Earth.

14. Get ¼ sheet of paper and answer the following:
1. What are the 3 main layers of the Earth?
2. Which layer is the least dense?
3. Which core layer is solid iron and nickel?
4. The motion in this layer is the reason Earth
has a magnetic field.