I think your answer would be b.
A reef than surrounds a volcanic island is an : Atoll
Atoll usually takes shapes in a form of ring that surround the areas of volcanic island that consist of corals. It usually only exist in warm waters, so volcanic islands will provide perfect environment for the corals
hope this helps<span />
Answer:
steam turbine was invented in 1884!
hope this helps.
Northeast
Thank you hope this helps :)
