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.