How do we know what is beneath our feet?
1. We can study the material ejected from volcanoes.
2. We can study earthquake waves to understand the different layers.
Crust - made up of two types of rock, Continential crust (granite) & Oceanic crust (balsalt). The crust is broken up into plates which float on the mantle.
Mantle - a layer of molten rock. temperature increases with depth. ie. some areas are warmer than others. these heat differences set up convectional currents in the mantle ie. it moves.
Core - Inner core and Outer core. made of dense rock - iron & nickel. temperatures in 5000 degrees celcius +. outer core liquid. inner core solid of weight of the earth above.
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