Constructive (divergent) plate margins

Question 1

What happens?

Answer 1

• Two plates separate = constructive margin
• New crust formed as gap is created + filled by magma rising from asthenosphere = cools, solidifies
  = Basaltic rock

Question 2

Oceanic

Answer 2

• Sea-floor spreads

- Occur on either side of mid-ocean ridges

Question 3

Continental

Answer 3

• Stretching and collapsing of crust

= Rift valleys