plate margins

Question 1

what happens on a constructive PM

Answer 1

-plates move away from eachother
-molten magma rises between the plates and cools to form solid rock

Question 2

what happens when magma reaches the surface on a constructive PM

Answer 2

produces runny lava that spreads out before solidifying

Question 3

what type of volcano does a constructive plate margin form

Answer 3

-shield volacno

Question 4

What happens on a destructive PM

Answer 4

-oceanic and continental plates move towards eachother
-the dense oceanic plate is sub ducted under the continental plate and into the earths mantle where it melts

Question 5

explain volcanic eruptions on a destructive plate margin

Answer 5

-can be very violent because the lava is thick and viscous(sticky)

Question 6

what happens when pressure is released at destructive PM

Answer 6

-alot of friction causes pressure to build up and when the pressure is released, very violent earthquakes occur

Question 7

Constructive PM

Answer 7

-plates move along side eachother
-plates move in same direction but different speeds

Question 8

how do earthquakes occur on conservative plate margins

Answer 8

as plates move past eachother, friction causes em to become stuck.
eventually pressure builds up causing very violent earthquakes

Question 9

why do volcanoes not occur on conservative PM

Answer 9

there is no gap or vent for magma to rise througu