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18 Cards in this Set
- Front
- Back
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who created the theory of continental drift?
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Alfred Wegener
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What is the name of the super continent that was existing around 200 million years ago?
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Pangaea
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Each of the rigid slabs of Earth’s lithosphere is referred to as a...
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volcanic plate
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___________ is the theory explaining the production of new seafloor between two diverging plates.
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seafloor spreading
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The type of plate boundary where plates move together, causing one of the slabs to be consumed into the mantle as it descends beneath an overriding plate, is referred to as_______________
a(n) |
convergent plate boundary
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Remanent magnetism in rock bodies is referred to as
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paleomagnetism
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What theory states that Earth’s rigid outer shell is broken into about twenty rigid slabs.
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plate tectonics
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The type of plate boundary where plates move apart, resulting in the upwelling of material from the mantle to create new seafloor, is referred to as a(n)
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normal polarity
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Material displaced downward along spreading centers creates a downfaulted valley called a(n)
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rift valley
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____________ is the idea that the Earth’s magnetic poles have migrated greatly through time.
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polar wondering
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A chain of small volcanic islands that forms when two oceanic slabs converge, one descending beneath the other, is called a(n)
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volcanic island arc
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As an oceanic plate slides beneath an overriding plate, a deep, linear feature, called a(n)
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deep ocean trench
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Explain how the Appalachian Mountains can be used as evidence to show that the continents were once attached.
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The age and type of rock show that the Appalachian mt. were from that time
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How has the age of the ocean floor been able to prove plate tectonics
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The age of the floor is older farther away from the ridges
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How are earthquake paterns supporting plate tectonics
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earthquakes are occuring along the bounderies of plate tectonics
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What is seafloor spreading?
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Seafloor spreading is a process that occurs at mid-ocean ridge zone, where new oceanic crust is formed through volcanic acticity and then gradually moves away from the ridge.
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What happens at a subduction zone?
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A subduction zone is where one plate (usually the ocean plate) dives under another (continental) plate.
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What are the names of the two supercontinents that made up the supercontinent Pangaea?
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Gandwana and Laurasia
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