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Plate Tectonics S4&5

QuestionAnswer
Sonar A device that sends out and receives back sound waves and measures distance to another object
Sea-floor spreading Harry Hess’s theory that new ocean floor is being created where plates move apart
Subduction the process by which oceanic crust sinks beneath a trench and back into the mantle at a convergent plate boundary
Mid-ocean ridge Underwater mountain chain that curves through all Earth’s oceans
Deep-ocean trench The deepest places on Earth; places where the ocean floor sinks into the mantle
Transform boundary Place where two plates slide past each other
Scientific theory A well-tested concept that explains a wide range of observations
Divergent boundary Place where two plates move apart; most are at mid-ocean ridges
Plate tectonics Theory stating pieces of Earth’s lithosphere are in slow, constant motion, driven by convection currents in the mantle
Plates Individual pieces of the lithosphere ; contain continents and oceans
Convergent boundary Place where two plates come together; one usually gets forced under the other
Rift valley Divergent boundaries that occur on land
Created by: MrogersBCMS
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