1. Earth’s Composition 9/21/15 7-1a pgs. 166-167 IN: What do you think the inside of the Earth looks like? (You can draw a model) (Glue in the new Table of Contents) Put your Word Search on the table

2. Earth’s Layers  Scientists think about Earth’s layers in two ways. –1. composition –2. physical properties

3. What is composition?  The different mixtures of the elements in the different layers.

4. What are physical properties?  Physical properties include temperature, density and the ability of the material to move or flow.  As you go deeper inside the Earth both temperature and density increase.

5. Composition of Earth  The lightest materials make up the outermost layer, and the densest materials make up the inner layers.

6. 4 Layers Compositional Layers Crust Mantle Outer Core Inner Core

7. The Crust  Crust - the outermost layer of the Earth. –It is the layer you live on!

8. The Crust  There are two types of crust. –1. Continental crust –2. Oceanic crust

9. Continental Crust  Everything not covered by the ocean.  The continental crust is less dense than the oceanic crust.

10. Oceanic Crust  Everything covered by the ocean.  The oceanic crust is more dense than the continental crust. Thickness of the Crust is about 5-50 km or 3-30 miles.

11.  Why do you think the oceanic crust is more dense than the continental crust?

12. The Mantle  Mantle - the layer of the Earth between the crust and core.

13. The Mantle  No one has ever seen what the mantle really looks like because it is too far down.  The mantle does rise to the surface. –Tectonic forces –Underwater volcanoes

14. The Mantle  Contains most of the Earth's mass.

15. The Core  Extends from the bottom of the mantle to the center of the Earth. –Made mostly of iron.  Divided into 2 parts. –Outer core –Inner core

16. Outer Core  Outer Core - liquid layer of the Earth’s core. –Lies beneath the mantle.

17. Inner Core  Inner Core - the solid, dense center of our planet. –Made up of iron and nickel.

18. 1. Cut, color, label and glue in the diagram. OUT: Why do you think the outer core is liquid while the inner core is solid?