Ecosystem Under the Sea, the Great Barrier Is One
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2178, Puzzle 4 (Burial Grounds).
Question is: Ecosystem Under the Sea, the Great Barrier Is One
and the answer is: CORALREEF
Word Meaning:
CORAL REEF — A reef formed by compacted coral skeletons
Definitions from Wiktionary.