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Geography 204 > Plate Boundaries > Flashcards

Plate Boundaries Flashcards

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1
Q

what are the three types of plate boundaries

A
  • divergent
  • convergent
  • transform
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2
Q

what is the lithosphere

A
  • the crust and the uppermost mantle which is solid
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3
Q

what can lithospheric plates be

A

continental crust, oceanic crust or a combination

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4
Q

what does the crust at the boundary define

A

used to define the boundary sub-type

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5
Q

what are divergent plate boundaries 4

A
  • plates that move apart
  • they form new basaltic crust
  • create shallow earthquakes
  • minor volcanism
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6
Q

what are the two sub-classes of divergent plate boundaries

A
  • oceanic-oceanic divergent

- continental-continental divergent

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7
Q

oceanic-oceanic divergent plate boundaries have created…

A

rifting and spreading along a narrow zone have created the Mid-Atlantic ridge

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8
Q

what is the mid-atlantic ridge

A

mountain chain where volcanos and earthquakes are concentrated

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9
Q

example of two plates that represent the oceanic-oceanic divergent plate boundary

A

north-american plate Eurasian plate

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10
Q

continental-continental divergent plate boundary has created…

A

in east africa, an earlier stage of rifting and spreading has created parallel valleys ina. zone with volcanos and earthquakes

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11
Q

continental-continental divergent plate boundary example of two plates

A

african plate somali subplate

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12
Q

define convergent plate boundaries 5

A
  • plates colliding together
  • shallow and deep earthquakes
  • mountains created
  • trenches and volcanos sometimes
  • continental arcs and island arcs
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13
Q

what are the three sub-classes of convergent plate boundaries

A
  • oceanic-oceanic convergent
  • continental- continental convergent
  • continental-oceanic convergent
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14
Q

oceanic-oceanic convergent plate boundaries create… & the two examples

A

they form a deep-sea trench and a volcanic arc

mariana islands, marianas trench

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15
Q

the two plates colliding forming oceanic-oceanic convergent boundary

A

philippine plate ->

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16
Q

what are island arcs

A
  • cerated by a subduction of. an oceanic plate
  • the islands will form on the overriding plate
  • oceanic trenches
17
Q

example off island arcs

A

pacific ring of fire

18
Q

oceanic-continental convergent causes…

A

the oceanic plate will subduct and a volcanic belt of mountains form at the continental plate margin

19
Q

two plates forming a continental-oceanic plate boundary

A

nazca plate ->

20
Q

wadati- benioff zone run down

A
  • zone of earthquakes that extend away from the plate boundary
  • earthquakes show depth zones (shallow near the boundary line and deeper the further awaY)
  • depth also shows the descending oceanic plate
21
Q

how is the wadati-benioff zone created

A

created by subduction of an oceanic plate

22
Q

accreted terranes def

A

small crustal mass transported from afar

- fused on the continent through collision

23
Q

continental- continental convergent plate boundary causes

A

the crust crumples and thickens, creating high mountains and a wide platea

24
Q

two paltes colliding forming a continental-continental convergent palte boundary

A

indian-australian plate ->

25
Q

transform plate boundaries def

A
  • plates that slide past each-other
  • create shallow earthquakes
  • valleys and mountains are possible
26
Q

what are the two subclasses of transform plate boundaries

A
  • oceanic-oceanic transform

- continental- continental transform

27
Q

continental-continental transform plate boundaries creates…

A

faults. the san andreas fault line is an example of two continental crusts sliding past eachother.

28
Q

two plates that slide past eachother creating a transform boundary line

A

pacific plate and the north american plate

29
Q

oceanic-oceanic transform plate boundary creates…

A

spreading centers are often offset by mid-oceanic ridge transform faults, where two oceanic plates slide horizontally past eachother

30
Q

what are two plates that are sliding past each other creating an oceanic-oceanic transform plate boundary

A

north american plate and eurasian plate

31
Q

how are hot spots created

A
  • created by mantle plume = stationary heat source
  • not a plate boundary
  • shallow earthquakes
  • volcanos
32
Q

mantle plume def

A

stationary heat source

33
Q

what are plate boundaries

A

occur at the contact of one or more lithospheric plates

34
Q

wha can boundaries create

A

different landforms, and tectonic activity including volcanos and earthquakes

Geography 204 (5 decks)

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