EARTH'S LAYER

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: What are the 3 main layers of the Earth? Which layer is the least dense? Which core layer is solid iron and nickel? The motion in this layer is the reason Earth has a magnetic field.