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.
The popularity of people is decreasing
The answer is C
the continental crust is mostly granite while the oceanic crust is mostly basalt
I know jobs for one, over population maybe, and because they are worried that dangerous people could be entering into the country with intention to harm. (unless this is a "only 3 right answer" kind of thing)