Topic 3: Lesson 1: Plate Motion Flashcards

Earth's Systems

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1
Q

an undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean

A

mid-ocean ridge

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2
Q

the process by which molten material adds new oceanic crust to the ocean floor

A

sea floor spreading

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3
Q

the process by which oceanic crust sinks deep beneath a deep-ocean trench and back into the mantle at a convergent plate boundary

A

subduction

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4
Q

an undersea valley that represents one of the deepest part of the ocean

A

ocean trench

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5
Q

rock farther away from a mid-ocean ridge

A

older

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6
Q

rock closer to a mid-ocean ridge

A

newer

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7
Q

drives plate motion

A

convection currents in the mantle

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8
Q

three pieces of evidence that supports the Theory of Continental Drift

A

fossils, land forms, and climate

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9
Q

step one of sea-floor spreading

A

molten material flows upward through a mid-ocean ridge

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10
Q

step two of sea-floor spreading

A

molten material hardens into strips of rock on either side of the mid-ocean ridge

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11
Q

step three of sea-floor spreading

A

the ocean floor on both sides of the mid-ocean ridge move further away from it

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12
Q

step four of sea-floor spreading

A

the ocean floor widens

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13
Q

the Atlantic Ocean has a_____, while the Pacific Ocean has more_____, which causes the Atlantic to widen and the Pacific to shrink

A

growing mid-ocean ridge–subduction zones

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