convergent/ destructive plate margin

Question 1

what is a convergent/destructive plate margin

Answer 1

In plate tectonics, a convergent boundary, also known as a destructive plate boundary (because of subduction), is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.

Question 2

what happens at convergent margins

Answer 2

As a result of pressure, friction, and plate material melting in the mantle, earthquakes and volcanoes are common near convergent boundaries.

Question 3

types of plate margin

Answer 3

continental-oceanic margin
oceanic - oceanic
continental to continental

Question 4

what is subduction

Answer 4

where one plate goes beneath another

Question 5

what is uplift

Answer 5

where plates collide head on causing uplift creating mountain ranges

Question 6

example of subduction

Answer 6

nazca - south american plate

Question 7

example of uplift

Answer 7

himalayas

Question 8

how do earthquakes happen

Answer 8

at faults (margin boundary) where stored energy is released when moved

Question 9

sideways movement of plate?

Answer 9

conservative margin (susceptable to transform faulting)

Question 10

how do earthquakes occur on faults?

Answer 10

fault movement releases energy**

Question 11

what is a hot spot?

Answer 11

volcano within a plate, which is the surface expression of a mantle plume

Question 12

what is an island arc

Answer 12

islands created by volcanic activity from hot spot.

Question 13

what is an volcanic arc

Answer 13

occur on

Question 14

example of island arc

Answer 14

hawaii/mariana islands

Question 15

example of volcanic arc

Answer 15

andean volcanic belt

Question 16

why does oceanic plate go under continental?

Answer 16

beause it is heavier (igneous rocks basalt, gabbro, dolorite)

Question 17

why is there volcanic activity at construuctive margins

Answer 17

because the oceanic crust melts under the continental crust. melts due to heat from friction and being closer to the core. turns to magma, supplying volcanoes

Question 18

where do island arcs occur

Answer 18

O-O margins

Question 19

where do volcanic arcs occur?

Answer 19

O-C margins

Question 20

where does uplift occur?

Answer 20

C-C margins

Question 21

deep ocean trench

Answer 21

marianas trench (west pacific) (deepest trench)

Question 22

convergent margins create earthquakes by…

Answer 22

..friction

Question 23

super continent , africa and south america

Answer 23

godwanaland

Question 24

technique to construct a 3D image of heat flow within the earth

Answer 24

siesmic tomography

Question 25

earthquakes in convergent margins DEPTH

Answer 25

shallow-deep

0-700km

Question 26

earthquakes in convergent margins MAGNITUDE

Answer 26

high magnitutde

Question 27

earthquakes in convergent margins FREQUENCY

Answer 27

low frequency

Question 28

earthquakes in divergent margins DEPTH

Answer 28

shallow

0-70km

Question 29

earthquakes in divergent margins MAGNITUDE

Answer 29

low magnitude

Question 30

earthquakes in divergent margins FREQUENCY

Answer 30

high frequency

Question 31

HOT SPOT?

Answer 31

formed from MANTLE PLUME, fixed in place, creates volcanic/island arc.

Question 32

Mantle plume

Answer 32

stationary area of high heat fllow in the mantle, produces magma that that feeds hot spot volcanoes