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Geography > EARTHS STRUCTURE > Flashcards

EARTHS STRUCTURE Flashcards

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1
Q

how thick is the oceanic crust

A

6-10KM

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2
Q

what rocks is the oceanic crust made from

A

sedimentary

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3
Q

how thick is he continental crust

A

30-60KM

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4
Q

what rocks is the oceanic crust made from

A

ganite

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5
Q

what is it called where the crust meets the mantle

A

continental shelf

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6
Q

what is the asthenosphere

A

upper mantle

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7
Q

what is pangea today

A

laurasia and gonwanaland

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8
Q

what proof is given that pangea existed

A

matching coasts = africa and south america

matching mountains = scandanavia and usa

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9
Q

what is the name given to plates that separate

A

constructive divergent

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10
Q

what is the name given to plates that collide

A

destructive convergent

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11
Q

what is the name given to plates that slide past eachother

A

tranverse

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12
Q

what is formed from constructive plates

A

mid ocean ridges

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13
Q

what is a rift valley

A

as the crust splits a rift valley allows the maga to rise and fill the gap

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14
Q

examples of divergent plates

A

usa and europe

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15
Q

what is formed at continental continental convergent plates

A

fold mountains

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16
Q

example of fold mountains

A

himalayas from the eurasian and indian plate

17
Q

what is formed at oceanic and continental convergent plates

A

subduction zones

18
Q

what happens at a subduction zone

A

heavier oceanic crust slides under the continenta crust
melted crust turns to magma and moves up tjhrough the continental crust creating volcanoes
trenches are also created where the two plates collided

19
Q

what are terranes

A

sediments carried on the sea floor when thr oceanic plate sinks the sediments stick to the side of the continental plate

20
Q

what is formed at oceanic oceanic plates that collide

A

trenches and island arcs

21
Q

what happens at oceanic oceanic plates that collide

A

one subducts and a trench is formed, eat=rth quakes occur. Volcanic islands called sea arcs occur

22
Q

what is the name given to rising melted magma that breaks through the crust

A

plumes

23
Q

what are transverse plate boundaries marked by

A

fault lines

24
Q

name a plate boundary line

A

between the pacific plate and north american plate

25
Q

what is a hot spot

A

deep areas in the upper mantle where a coumn of magma rises and pushed through the surface

26
Q

what are the name of the forces that change the planet

A

endogenic - under earths surface eg magma moving

exogenic - earths surface eg weathering and erosion

27
Q

what is the name for where crust turns into mantle

A

mohorovicic discontinuity

28
Q

what is subduction

A

when the heavier plate sinks and is melted o magma and is recycled

Geography (9 decks)

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