Restless Earth

Upper mantle --> Lower mantle --> Outer core --> Inner core

Continental Crust - 30-50km      Oceanic Crust - 6-8km            

Continents were once joined together - Panega

Constructive plate boundaries: when two plates move apart

Destuctive plate boundaries: when two plates collide

Conservative plate boundaries: when two plates slide past each other


Most volcanic eruptions with high death tolls are in the developing world.

Mt. Nyiragongo-14 villages destroyed, 100 people died, 12,500 homes destroyed, 400,000 people were evacuated. UN sent in 260 tonnes food, TV appeals, $35m give from the world.

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