The giant continent was called...
a. Pangaea
The name of the volcano is SANTORINI.
Santorini is an island in Greece and this name is used to called the volcano which occurred there. Santorini is an a dormant and active volcano; its last eruption was in 1950. The volcano of Santorini is a very famous volcano in Greece and it has the highest crater in the world.
Sea floor spreading adds more crust to the ocean floor and at the same time older strips of rock move outward from either side of the ridge.