plate boundaries Flashcards
1
Q
destructive margins=
A
move towards each other
2
Q
constructive margins=
A
move away from each other
3
Q
conservative margins=
A
move parallel to each other
4
Q
DESTRUCTIVE- continental-oceanic
A
- denser plate subduct below continental
- oceanic crust is heated by friction and melts
- this extra magma causes pressure which weakens con plate causing violent volcanoes
- where the plates get stuck cause earthquakes
5
Q
DESTRUCTIVE-oceanic-oceanic
A
- one plate is always denser so subduct causing earthquakes as they move
- pressure in the Benioff zone causes underwater volcanoes
6
Q
DESTRUCTIVE- continental-continental
A
- neither plate is sense so there’s no subduction so no volcanic eruptions
- the pressure builds up to cause earthquakes
7
Q
CONSTRUCTIVE- oceanic-oceanic
A
- plate moving apart causes magma to rise and cool to form new land
- the lava Is basaltic
- this creates underwater volcanoes
- earthquakes form by the movement of magma through the crust
8
Q
CONSTRUCTIVE- continental-continental
A
- any land in the middle of the separation is forced apart causing fault lines
9
Q
conservative
A
- plates moving past eachother
- friction causes pressure to build
- fault lines occur where the ground is cracked by the movement
- once the plates slip it causes a powerful earthquake
