1. The Earth’s Layers

2. Objective:
The learner will be able to identify characteristics of the Earth's layers.

3. The Earth is divided into three layers.

5. Crust
The crust is the layer that you live on so it is the most widely studied and understood.

6. Crust
The crust is made of the lightest matter and the core consists of heavy metals

8. Crust
The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers.

9. Crust
The crust of the Earth is broken into many pieces called plates. The plates move along the soft mantle which is the layer located below the crust.

10. Crust
The plates move along smoothly but sometimes they get stuck and pressure builds up.

11. The pressure builds and causes an Earthquake as rocks break and crack.
Crust
                                                                                 
San Francisco City Hall after the 1906 Earthquake. (from Steinbrugge Collection of the UC Berkeley Earthquake Engineering Research Center)
The pressure builds and causes an Earthquake as rocks break and crack.

12. Mantle The mantle is the largest layer of the Earth.
It is made of hot, dense rock. The rock in the mantle flows like asphalt because of the temperature differences found in the mantle.

13. Mantle
The movement of the mantle create the movement of the Earth’s plates.

14. Core
The core of the Earth is much like a ball of very hot metals. The inner core is surrounded by a fluid iron outer core.

15. Core