M., bluff, olde, mount, Mt., pk., cape, Ft., Pt..
We have already described the great difference between the corals within the lagoon of an atoll
and those on its outer margin.
But there is a third kind of reef, of very common occurrence in the Pacific and Indian Oceans, which goes by the name of " atoll."
And, finally, that if the relative level of the sea rise so much that the encircled land is completely submerged, the reef must necessarily pass into the condition of an atoll.