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Convection Currents and HOT SPOTS. Driving force behind plate tectonics. CONVECTION CURRENTS IN MANTLE Hot magma rises (less dense), cool magma sinks (more dense) Cool sinks
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Driving force behind plate tectonics • CONVECTION CURRENTS IN MANTLE • Hot magma rises (less dense), cool magma sinks (more dense) • Cool sinks • (more • dense)
Problems with Theory • HOT SPOTS • Not associated with plate boundaries • Plates move over areas of rising magma (Mantle thermal plumes) • Can infer direction of plate movement • Older volcanoes the farther you are from hot spot