The Mechanics of Plate Movements (Grade 10 NSC Matric Geography): Flashcards
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Main driving force behind plate movement
Main driving force behind plate movement
Convection currents in the mantle
What convection currents resemble
What convection currents resemble
Water boiling - hot rises, cool sinks, circular movement
What heats mantle material causing it to rise
What heats mantle material causing it to rise
Heat from Earth's core
Underwater mountain ranges where new ocean crust forms
Underwater mountain ranges where new ocean crust forms
Ridges
Process where new oceanic crust is created at ridges
Process where new oceanic crust is created at ridges
Seafloor spreading
Process where oceanic plate slides beneath continental plate
Process where oceanic plate slides beneath continental plate
Subduction
Deep cracks in ocean floor where oceanic plate descends
Deep cracks in ocean floor where oceanic plate descends
Trenches
What happens to oceanic plate at subduction zones
What happens to oceanic plate at subduction zones
Melts and becomes part of mantle again
What triggers volcanic eruptions above subduction zones
What triggers volcanic eruptions above subduction zones
Melting oceanic plate
Typical speed of plate movement per year
Typical speed of plate movement per year
A few centimetres