Plate Margins

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Where new crust is generated as the plates pull away from each other
Constructive/Divergent
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Where crust is destroyed as one plate moves under another
Destructive/Convergent
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Where crust is neither produced nor destroyed as the plates slide horizontally past each other
Conservative/Transform
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Have a total length of 60,000km
Oceanic Ridges
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In some parts they rise to over 3,000m above the ocean floor
Oceanic Ridges
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Largest example of an Oceanic Ridge
Iceland, on the MId-Atlantic Ridge
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An Oceanic Ridge forms along which type of margin
Constructive
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Where do Rift Valleys occur
At Constructive margins in Continential areas
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What causes Rift Valleys
Heating and doming up of the crust leads to fracturing and rifting
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Largest example of a Rift Valley
Great East African Rift Valley - 4,000km long and 50km wide
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Which landforms occur at Subduction zones
Volcanoes
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The 1st type of destructive/convergent margins
Ocean plate colliding with a less dense continental plate
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The 2nd type of destructive/convergent margins
Ocean plate colliding with another ocean plate
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The 3rd type of destructive/convergent margins
Continental plate colliding with another continental plate
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What is formed when two continental plates collide
Fold Mountains
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The San Andreas Fault is an exaple of which margin
Conservative
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Two examples of oceanic-oceanic convergence
Peru-Chile Trench and an Island Arc
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Originates deep within the asthenosphere as molten rock which rises and melts through the lithosperic plate forming a large volcanic mass at a hot spot
Mantle Plumes
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Consists of the crust and the rigid upper section of the mantle
Lithosphere
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Semi-molten mass below the lithosphere on which the plates float
Asthenosphere
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What are convection currents
Zones of hotter, more liquid magma with circlatory motion in the astheonsphere that causes the plate to move
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Theory by Alfred Wegener in 1912 that all the continents used to be joined together 250m years ago
Supercontinent - Pangea
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Other cards in this set

Card 2

Front

Where crust is destroyed as one plate moves under another

Back

Destructive/Convergent

Card 3

Front

Where crust is neither produced nor destroyed as the plates slide horizontally past each other

Back

Preview of the front of card 3

Card 4

Front

Have a total length of 60,000km

Back

Preview of the front of card 4

Card 5

Front

In some parts they rise to over 3,000m above the ocean floor

Back

Preview of the front of card 5
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