Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/thermal-stress-hits-coral-reef-scientists-warn-about-bleaching-andaman
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-chronicle-telangana
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/telangana
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/corals
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coastal-regulations
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andaman-islands
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecosystems
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment