A community of plants and animals that interact with each other and their physical environment., ecosystem, Large underwater structures composed of calcium carbonate built by colonies of living organisms called coral polyps., Coral reefs, Coastal marine waters with low water depths (typically under 25 to 60 metres) where sunlight easily penetrates to the seabed., Shallow sea, The concentration of dissolved salt compounds present in a given volume of seawater., Salinity, The number and variety of living species found in a given area or ecosystem., Biodiversity, Leisure, sport, and tourism activities for human enjoyment and economic benefit., Recreational opportunities, The populations or reserves of fish species in a marine or coastal region available for commercial or subsistence harvesting., Fish stocks, The unsustainable harvesting of fish species from marine waters at a rate faster than fish populations can naturally reproduce and replenish., Overfishing, An ecological stress response of corals which expels the algae living in their tissues, causing the corals to turn completely white., Coral bleaching, The long-term rise in average global atmospheric and ocean temperatures over time., Global warming, The geographic zone of the Earth surrounding the Equator, located between the Tropic of Cancer (23.5°N) and the Tropic of Capricorn (23.5°S)., Tropics

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