Key Points
- The Earth consists of a series of layers. Starting from the surface we have the crust, the mantle then the core in the centre. A thin layer of gases called the atmosphere surronds the Earth.
- The Earth limited resources come from its crust, the oceans and the atmosphere.
Atmosphere
About 80% of the air in our atmospher lies within 10km of the surface.
Crust
The average thickness of the crust is about 6km under the oceans about 35km under continental areas.
Mantle
Starts underneath crustand continues to about 3000km below the earths surface. Behaves like a solid but is able to flow very slowly.
Core
Radius of about 3500km. Made of nickel and iron. Outer core is liquid, inner core solid.
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