The Earth

Earthquake waves cannot travel through a liquid.

A passive plate margin is where the continental crust changes to oceanic crust.

The Earth is shaped by endogenic (internal) forces e.g. plate tectonics and exogenic (external) forces e.g. weathering

The moho (mohorovicic discontinuity) is the line marking the boundary between the mantle and the crust.

The lithosphere consists of the crust and the solid upper mantle.

The temperature in the inner core is roughly 5000 degrees celsius.

The inner core - iron and nickelThe outer core - ironThe mantle - molten/semi-molten rockThe crust - oceanic/continentalOceanic - e.g. basalt (SiMa 3-10km, dense, younger)Continental - e.g. granite (SiAl 30-70km, less dense, older)

Convection currents occur in the asthenosphere in the upper mantle.

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