http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Medicine/oddsnends.htm
The
three types of coral reefs are: 1) fringing reefs, submerged platforms that extend from the shore into the sea; 2) barrier reefs, which follow the shoreline but are separated from it by water; and 3) tolls, ring-shaped coral islands in the open sea; an atoll is often the rim of an
open volcano, and is most common inn the South Pacific.