PMT - different plate boundaries constructive oceanic and oceanic

Question 1

explain the process of a constructive oceanic plate boundary?

Answer 1

• Magma rises in between the gap left
  by the two plates separating, forming
  new land when it cools
• Less explosive underwater volcanoes
  formed as magma rises
• New land forming on the ocean floor by
  lava filling the gaps is known as sea
  floor spreading (as the floor spreads
  and gets wider)