1. Layers of Earth

2. Layers by their Chemical Composition
Crust
Mantle
Core

3. The Crust Outermost, thinnest layer 5 to 100km thick Solid
Two types: Continental and Oceanic
Composition: Oxygen, silicon, and aluminum

6. The Mantle Between the crust and core 2,900km thick Thickest layer
Solid but soft enough to flow through.
No one has ever visited the mantle.
Scientists observe Earth’s surface to conclude composition.
Composition: Magnesium

7. Convection Currents: 1 possible cause of tectonic plate motion
Like hot air rise, cool air sinks.
Causes lithosphere to move sideways and away from the mid-ocean ridge.

8. The Core Below the mantle to the center of Earth Radius of 3,430 km
Makes up 33% of Earth’s mass.
Composition: Mostly iron, nickel
Inner core is solid
Outer core is liquid

9. Draw the layers of Earth based on chemical composition.
Who can teach this?

10. Review!

11. This is the thickest layer.
The Mantle
This is the thickest layer.

12. We live on top of this layer.
The Crust
We live on top of this layer.

13. This layer is the thinnest.
The Crust
This layer is the thinnest.

14. This layer is made up of convection currents.
The Mantle
This layer is made up of convection currents.

15. This layer is the central part of the Earth.
The Core
This layer is the central part of the Earth.

16. Composed of Oxygen, Silicon, and Magnesium
The Crust
Composed of Oxygen, Silicon, and Magnesium

17. Group work!
Step 1: Get into your groups. Step 2: Create a story about the 3 chemical layers of Earth. Step 3: This story should relate to the composition, state of matter, and thickness of the layer. Step 4: Create a picture that relates to the story. I am accepting one written copy of the story and one drawing per group.

18. Open those Science Books!!!
Step 1: Find a partner Step 2: Get a science textbook Step 3: Describe the 5 physical layers of Earth by answering the following questions. Which layer is composed of tectonic plates? Which layer is the lowest part of the mantle? Which layer is the liquid layer? Which layer is made of solid rock?