Geography - Plates

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how do constructive plates moves?
away from each other
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how do destructive plates move?
oceanic plate over continental plate
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how do passive plates move?
alongside each other
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when is pressure released with constructive plates?
when the plates move apart
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how is new crust formed at constructive plate boundaries?
when magma pours out onto the sea floor
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what natural hazard occurs at constructive plate boundaries?
earthquakes and volcanoes
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what natural hazard occurs at destructive plate boundaries?
earthquakes and volcanos
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give an example of a constructive plate boundary
N.American and Eurasian
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give an example of a destructive plate boundary
Nazca (oceanic) and S.American (continental)
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give an example of a passive plate boundary
Pacific and North American
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what natural hazard forms at a passive plate boundary?
earthquakes
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why do volcanoes form at constructive plate boundaries?
as the plates move apart, the magma rises to the crust, solidifies and forms new sea floor, this builds up and can become a volcano under the water
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why do volcanoes form at destructive plate boundaries?
oceanic sub-ducted under continental, oceanic melts into magma, magma breaks surface, solidifying forming a violent volcano
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what are there no volcanoes at passive plate boundaries?
the platesare not being created or destroted
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what intensity are the earthquakes at constructive plate boundaries?
low intensity
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why are there earthquakes at passive plate boundaries?
the plates move past each other with great friction in jerks, often getting stuck, when the pressure is released there is often a massive earthquake
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why are there earthquakes at constructive plate boundaries?
as the plates move apart, pressure is released creating earthquakes
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how many cm per year are the Pacific and N.American plate sliding past each other (passive)?
6cm
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why are there earthquakes at destructive plate boundaries?
as plates slide over each other, the surfaces get stuck, causing pressure to build up leading to massive earthquakes
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what intensity are the earthquakes at destructive plate boundaries
high intensity
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what intensity are the earthquakes at passive plate boundaries?
high intensity
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describe the distribution of volcanoes (3 marks)
Majority of volcanoes are located on plate boundaries (such as Nazca and S.America). Often found in lines and grouped together. Located all around the Pacific Ocean.
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Other cards in this set

Card 2

Front

how do destructive plates move?

Back

oceanic plate over continental plate

Card 3

Front

how do passive plates move?

Back

Preview of the front of card 3

Card 4

Front

when is pressure released with constructive plates?

Back

Preview of the front of card 4

Card 5

Front

how is new crust formed at constructive plate boundaries?

Back

Preview of the front of card 5
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