tectonic plate theory

Question 1

oceanic continental

Answer 1

less denser oceanic crust is subducted beneath the less dence conitental crust
this forms a deep sea trench

eg:

it is a deconstructive margin

Question 2

deconstructive margin

oceanic oceanic

Answer 2

the two sections of oceanic crust have roughly the same density but the one which is slightly denser will be subducted

eg:

it is a deconstructive margin

Question 3

deconstructive margine

Answer 3

this occurs where two plates are moving towards eachother (converging)

Question 4

collision margin

Answer 4

this is where convergence (coming together) of the crust takes place

Question 5

continental continental

collision margin

Answer 5

at the collision margin, niether crust is subducted as they both havce the same density
* the two sections fold up against eachother
* this creates fold moutains as part of an enormous tectonic lift

eg: the himalayas

Question 6

constructive margin

Answer 6

this is where two plates are diverging (moving apart)

Question 7

continental continental or oceanic oceanic

constructive margin

Answer 7

• the mantle is under pressure from the plates above
• when they move apart, the pressure is released at the margin
• the release of pressure causes the mantle to melt, producing magma
• the magma is less dense than the pates above so it rises through the gap to produce new crust
• it can errupt to form a volcano

Question 8

what happens when

continental continental or oceanic oceanic

plates move at dissimilar speeds

constructive margin

Answer 8

• when the plates do not move in a uniform way (some moving faster than others) it causes pressure to build up.
• when the pressure becomes too much, the plate cracks, making a fault line and causing an earthquake
• further earthquakes may occur along the fault line once it has been created

Question 9

constructive margines create two different landforms

which are…

Answer 9

ocean ridges and rift valleys