Last Modified: 2011-06-30
2) Mineral phase change
2. Oceanic crust has similar composition and thickness throughout while in continental it varies.
3. Oceanic crust averages 7 km thick while cont is 40-70
Convection-transfer of heat by mass movement or circulation of a substance
2.crystallization of solid iron sinks to form inner core,leaves behind fluids, drives chem. convection
3.radioactive isotopes in core that drive thermal convection
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