Plate Boundaries

Question 1

what are the three types of plate boundaries

Answer 1

• divergent
• convergent
• transform

Question 2

what is the lithosphere

Answer 2

• the crust and the uppermost mantle which is solid

Question 3

what can lithospheric plates be

Answer 3

continental crust, oceanic crust or a combination

Question 4

what does the crust at the boundary define

Answer 4

used to define the boundary sub-type

Question 5

what are divergent plate boundaries 4

Answer 5

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

Question 6

what are the two sub-classes of divergent plate boundaries

Answer 6

• oceanic-oceanic divergent

- continental-continental divergent

Question 7

oceanic-oceanic divergent plate boundaries have created…

Answer 7

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

Question 8

what is the mid-atlantic ridge

Answer 8

mountain chain where volcanos and earthquakes are concentrated

Question 9

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

Answer 9

north-american plate Eurasian plate

Question 10

continental-continental divergent plate boundary has created…

Answer 10

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

Question 11

continental-continental divergent plate boundary example of two plates

Answer 11

african plate somali subplate

Question 12

define convergent plate boundaries 5

Answer 12

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

Question 13

what are the three sub-classes of convergent plate boundaries

Answer 13

• oceanic-oceanic convergent
• continental- continental convergent
• continental-oceanic convergent

Question 14

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

Answer 14

they form a deep-sea trench and a volcanic arc

mariana islands, marianas trench

Question 15

the two plates colliding forming oceanic-oceanic convergent boundary

Answer 15

philippine plate ->

Question 16

what are island arcs

Answer 16

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

Question 17

example off island arcs

Answer 17

pacific ring of fire

Question 18

oceanic-continental convergent causes…

Answer 18

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

Question 19

two plates forming a continental-oceanic plate boundary

Answer 19

nazca plate ->

Question 20

wadati- benioff zone run down

Answer 20

• 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

Question 21

how is the wadati-benioff zone created

Answer 21

created by subduction of an oceanic plate

Question 22

accreted terranes def

Answer 22

small crustal mass transported from afar

- fused on the continent through collision

Question 23

continental- continental convergent plate boundary causes

Answer 23

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

Question 24

two paltes colliding forming a continental-continental convergent palte boundary

Answer 24

indian-australian plate ->

Question 25

transform plate boundaries def

Answer 25

- plates that slide past each-other - create shallow earthquakes - valleys and mountains are possible

Question 26

what are the two subclasses of transform plate boundaries

Answer 26

- oceanic-oceanic transform | - continental- continental transform

Question 27

continental-continental transform plate boundaries creates...

Answer 27

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

Question 28

two plates that slide past eachother creating a transform boundary line

Answer 28

pacific plate and the north american plate

Question 29

oceanic-oceanic transform plate boundary creates...

Answer 29

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

Question 30

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

Answer 30

north american plate and eurasian plate

Question 31

how are hot spots created

Answer 31

- created by mantle plume = stationary heat source - not a plate boundary - shallow earthquakes - volcanos

Question 32

mantle plume def

Answer 32

stationary heat source

Question 33

what are plate boundaries

Answer 33

occur at the contact of one or more lithospheric plates

Question 34

wha can boundaries create

Answer 34

different landforms, and tectonic activity including volcanos and earthquakes