1. Lesson objectives
To be able to describe and label the properties of each of the earth’s layers
To understand that the earth’s crust is split into tectonic plates which float on top of the mantle.

2. Image from:http://www. singularvortex

3. Map from memory
Image from:

4. There are two types of crust:
Granite from the Continental crust
Basalt from the Oceanic crust
What are the differences between the two rock types?

5. Layer
Density (grams/ cm³)
Physical state
Composition
Temp (°C)
Lithosphere
Continental Crust
2.7
Solid
Granite
Air temp - 900
Oceanic Crust
3.3
Basalt
Mantle
Asthenosphere
Partially molten
Peridotite
Lower mantle
Core
Outer Core
Liquid
Iron and Nickel
Inner Core 15

6. The Japanese have built a tonne international scientific drilling ship, the Chikyu, which will drill 7km through the oceanic crust to reach the mantle – further than anyone has gone before!
Resource taken from Digby et al. (2009) gcse geography edexcel B.
You need to imagine that you are doing the same, only this time you are heading all the way down to the centre of the earth!

7. Imagine that you are drilling down through the earth to discover what lies beneath. In the boxes below, you need to explain your journey through the earth, giving details of each layer in as much detail as possible.
You will need to refer to whether the layer is solid, partially molten or liquid, the density, the composition (what it is made of) and finally how hot it is down there.

8. Earth’s Heat Engine
Earth’s Heat Engine

9. Crust
Convention Currents
Mantle

10. Continental crust
Oceanic crust
Ocean
Mantle
Core
Oceanic crust - This is younger, thinner, but denser and is found under the oceans. Basaltic composition
Continental crust - This is older, thicker but lighter and makes up the land. Granitic type rock

11. How does it all work?

12. How does it all work? Task-
1)Draw your own version of the convection currents diagram
2) Write a description of how the plates move- you may also do as story board/diagrams if you wish
As a class read page 12 and 13 of GCSE text book (purple one) then do tasks

13. What have you learned about the earth’s structure?
Plenary
What have you learned about the earth’s structure?

14. Homework
On Page 9 there is a table with all of the properties you need to know for your GCSE exam.
For next lesson, you need to learn all of the properties and be ready to fill in an incomplete table.