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27 Cards in this Set
- Front
- Back
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convergent boundry
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a plate boundary where two plates move toward each other
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deep ocean trench
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a deep valley along the ocean floor beneath which the crust slowly sinks toward the mantle
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divergent boundry
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a plat boundary where two plates move away from each other
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fault
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a break in the earths crust where masses of rock split past each other
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island arc
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a string of islands formed by volcanos along the deep ocean trench
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hot spot
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an area where magma from deep, within the mantle melts through the crust above it
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lava
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liquid magma that reaches the surface also the rock formed when the liquid lava hardens
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magma
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a molten mixture of rock- forming substances, gasses, and water from the mantle
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mid ocean ridge
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an under sea mountain chain where new ocean floor is produced; a divergent plate boundary
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plate
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a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continential and oceanic crust
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plate tectonics
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the theory that pieces of Earth's lithosphere are constantly in motion, DRIVEN BY CONVECTION CURRENTS IN THE MANTLE.
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rift valley
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a deep valley that forms where two plates move apart
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ring of fire
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a major belt of volcanos that rims the pacific ocean
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rift valley
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a deep valley that forms where two plates move apart
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ring of fire
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a major belt of volcanos that rims the pacific ocean
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rift valley
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a deep valley that forms where two plates move apart
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plate tectonics
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the theory that pieces of Earth's lithosphere are constantly in motion, DRIVEN BY CONVECTION CURRENTS IN THE MANTLE.
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ring of fire
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a major belt of volcanos that rims the pacific ocean
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scientific theory
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a well tested concept that explains a wide range of observations
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floor spreading
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the process by which molten material adds new oceanic crust to the ocean floor
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sonar
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a divice that determines the distance of an object under water by recording echoes of sound waves
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transform boundary
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a plate boundary where two plates move past each other in opposite directions
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subduction
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the process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary
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volcano
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a weak spot in the crust where magma has come to the surface
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volcano
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a weak spot in the crust where magma has come to the surface
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subduction
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the process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary
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volcano
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a weak spot in the crust where magma has come to the surface
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