2. Unlocking our Earth’s Mysteries Our Shifting World

3. Our Earth Below our feet, the earth is made up of different layers: – The Crust – The Mantle (sometimes split into upper and lower) – The Outer Core – The Inner Core

4. Our Earth

5. The Earth’s Geo-Zones The Earth is composed of 4 zones.They include: The Crust The Mantle The Outer Core The Inner Core

6. The Earth’s Crust The Crust makes up the top layer of the earth. It ranges from 90 km thick near mountains to only 6 km thick on the ocean floor. The total distance from the crust to the earth’s center is about 6400 km.

7. The Mantle The upper portion of the mantle is quite solid. The inner mantle is much softer as high pressure & temperature cause the rock to melt. This region is about 2900 km thick.

8. The Inner & Outer Core The outer core experiences temperatures so high that all rock is molten. This layer is very thick – 2200 km thick! The inner core is NOT liquid. It is solid due to the extreme weight of the outer layers.

9. Now it’s your turn… Draw a diagram of the earth’s geo-zones. Be sure that the layers are drawn to “scale” (e.g. 1 cm = 500 m etc.) You should use a compass and coloured pencils or markers. Label each “geo-zone” and state some characteristics of each zone.

10. Let’s Recap:

12. The Crust is Cracked!

13. The pieces of the crust are floating around on a mass of gooey, molten magma. They began moving millions of years ago and they continue to move today! Do you need proof?

14. Our Earth

15. The Earth’s Internal Furnace