AQA GCSE Geography - Tectonic Hazards

Simply name the 4 main layers of Earth in order from inside

• Inner core

• Outer core

• Mantle

• Crust

Earth’s inner core is — km in diameter, a — and — layer composed of iron and nickel with temperatures of about — C

1500

Solid

Dense

5500

Earth’s outer core is — km thick, a — — metal layer with temperatures between about — to — C

2100

Semi-molten

5000

5500

Earth’s mantle is — km thick, a — - — layer which is less dense than the — core

2900

Semi-molten

Outer

Name the 2 types of crust

• Oceanic

• Continental

The oceanic crust thinner/thicker (- - - km) but —. The continental crust is thinner/thicker (- - -km) but —.

• Thinner

• 5-10 km

• Denser

• Thicker

• 25-90 km

• Lighter

Which crust subducts under which?

Oceanic crust subducts under continental

Which crust is older, continental or oceanic?

Continental

The tectonic theory stated the movement of plates was the result of — —.

Convection currents

The slab pull theory suggests that the movement of plates is the result of…

The weight of denser oceanic plates subducting and dragging the rest of the plate along