Plates And Their Features

Question 1

At constructive plate boundaries what do you get there?

Answer 1

Mid ocean ridges
Rift valleys
Volcanoes

Question 2

What is a mid ocean ridge ? Which is the only plate they appear at?

Answer 2

A line of volcanoes under the sea
Constructive

Question 3

How is a mid ocean ridge formed?

Answer 3

As plates are pulling apart from each other, lava will fill the gap meaning that a big volcano can’t form as the lava don’t have time to pile up lots on top of each other as plates constantly pulling apart

Question 4

How is a rift valley formed?

Answer 4

1) plates are pulling apart from each other, which pushes up steam and gasses from the magma chamber, as tension faults and cracks appear
2) because the two plates are pulling apart so land sinks but the very middle gets pushed up because of pressure in the middle
3) as plates continue to pull apart a rift valley eventually forms (which is the sunken land), these continue to grow in size are some are MASSIVE

Question 5

Why are rift valleys generally very green land?

Answer 5

Because of the change in altitude, snow/ice melts onto the soil from mountains above giving the land moisture. Volcanic material is very fertile

Question 6

What is the only landform at conservative plate boundaries?

Answer 6

Fault lines

Question 7

Why do conservative plate boundaries only have one land feature?

Answer 7

Even though they get really powerful earthquakes, a lack of subduction of upwelling material at conservative margins means very little is visible in terms of landforms

Question 8

At which plate do rift valleys only occur at?

Answer 8

Conservative

Question 9

What are plates doing at destructive plate boundaries ?

Answer 9

Plates are moving together

Question 10

What 2 different types of plates are destructive ?

Answer 10

Subduction
Collision

Question 11

At subduction plates, what plates are involved (2)?

Answer 11

Oceanic going under oceanic
Oceanic going under continental

Question 12

At collision plates what plates are involved?

Answer 12

Continental colliding with a continental

Question 13

What happens when you having two oceanic plates ?

Answer 13

As they are moving towards each other, one is force under the other (subduction). The crust that is being sub ducted will be the one that is slightly denser (not much as they are the same density), or the one moving a bit quicker.

Question 14

What tectonic features occur when you have two oceanic plates?

Answer 14

Tsunami
Ocean trenches
Earthquakes
Island arc

Question 15

What is an example of a feature that occurs at oceanic and oceanic plate?

Answer 15

Philippine plate and pacific plate = Mariana’s trenches

Question 16

What happens when you have an oceanic and a continental plate?

Answer 16

The oceanic crust (denser) will subduct the continental crust into the upper mantle.

Question 17

What tectonic features occur at oceanic + continental plates ?

Answer 17

Deep ocean trenches (6km deep)
Fold mountains (as pressure put onto the continental crust can cause it to buckle upwards)
Explosive volcanoes

Question 18

What happens when you have two continental plates (collision)

Answer 18

Continental plates are of lower density than the asthenosphere beneath them … meaning subduction cannot occur, instead them collide with each other.

Question 19

What tectonic features occur at two continental plates?

Answer 19

Very powerful earthquakes
Fold mountains (sediment scraped off sea floor between the plates are compressed and get pushed upwards)

Question 20

What is an example of a collision plate boundary ?

Answer 20

The HIMALAYAS