Plate tectonics

Question 1

Which is more dense, a continental plate or oceanic plate

Answer 1

Oceanic plate is more dense - 3.0g/cm^3
Continental plate is less dense - 2.7g/cm^3

Question 2

Oceanic plates are composed of what type of rock

Answer 2

Basaltic rock

Question 3

Continental plates are composed of what type of rock

Answer 3

silica rich

Question 4

At what rate do lithospheric plates move

Answer 4

cm/year

Question 5

What are the 3 types of lithospheric plate boundaries

Answer 5

Divergent, convergent, transform

Question 6

Are divergent boundaries tension or compression

Answer 6

Tension

Question 7

Do divergent boundaries create r destroy crust

Answer 7

they’re constructive, so they create crust

Question 8

in divergent boundaries, new lithosphere can be created by what

Answer 8

volcanism

Question 9

What is an example of a divergent plate boundary rift valley

Answer 9

east-African rift valley

Question 10

Divergent plate boundaries typically create continental or oceanic crust

Answer 10

oceanic crust

Question 11

The mid-Atlantic ridge is what type of boundary

Answer 11

ocean-ocean divergent

Question 12

Why is there a lot of volcanic activity in Iceland

Answer 12

the mid-Atlantic ridge passes through it

Question 13

What kind of deposits do we find at divergent plate boundaries

Answer 13

metal deposits

Question 14

Is convergent plate boundaries compression or tension

Answer 14

Compressions, they’re in collision

Question 15

Convergent:
the_______ plate is forced beneath the other and down into
the mantle, this process is known as subduction

Answer 15

denser

Question 16

Do subduction zones have shallow or deep earthquakes

Answer 16

Both

Question 17

Is mt Fuji and Mt St Helens on a divergent or convergent boundary

Answer 17

convergent, its at a subduction zone

Question 18

Do convergent or divergent have higher heat flow?

Answer 18

Divergent has a high heat flow. Convergent has a low heat flow. Relative to the geothermal gradient

Question 19

if we have a oceanic-oceanic boundary, which plate will subduct

Answer 19

the cooler and more dense one

Question 20

Oceanic-oceanic can cause: a trench, volcanism, islands arcs

Answer 20

All of those

Question 21

Which type of convergent boundaries are most powerful

Answer 21

oceanic-continental
continental-continental

Question 22

Which type of convergent boundary does subduction not occur

Answer 22

continent-continent
instead mountains are built

Question 23

The Alps and Himalayas are examples of what type of plate boundary

Answer 23

Convergent continental-continental

Question 24

Which type of convergent boundary has little to no volcanism

Answer 24

continent-continent

Question 25

Which type of boundary does lithospheric material neither be created nor consumed

Answer 25

Transform

Question 26

Are the earthquakes from transform boundaries shallow or deep? and what is their intensity

Answer 26

Shallow but destructive earthquakes

Question 27

Which of the following occurs at a transform boundary: subduction, volcanism, trench, earthquakes

Answer 27

earthquakes

Question 28

transform faults are generally found ____________ to divergent ocean rift zones such as the Mid-Atlantic ridge

Answer 28

perpendicular

Question 29

Are hot spots associated with plate boundaries

Answer 29

No

Question 30

Describe how hotspots work

Answer 30

Mantle plume: upwelling of hot rocks in convectional cells in the mantle to the base of the lithosphere  Heat from the plume melts overlying rocks and magma seeps up to surface creating a volcano.

Question 31

Hot spots leave clues and can tell us about the movement of ______

Answer 31

plates

Question 32

Can use _______ evidence to work out direction, speed of plate movement over time

Answer 32

hotspot