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Coral reefs are colorful underwater structures. They're made up of the skeletons of colonial marine invertebrates.
Reefs are composed of hermatypic (hard) corals that extract calcium carbonate from seawater to create the covering for their soft bodies.
These structures grow as polyps (individual corals) that live on the existing exoskeleton build their own covering, which gradually connects to the original structure.
Climate change
Poison
Water pollution (oil spills, human waste)
Tourism
The United States Coral Reef Task Force (USCRTF) - preserves and protects coral reef ecosystems
NOAA's Coral Reef Conservation Program - multiple organizations come together to sustain and restore valuable reef ecosystems
Coral Reef Conservation Act - promotes the wise management and sustainable use of reefs, provides financial support for restoration projects, collects information on the condition of reefs & possible threats
Clean Water Act - regulates and protects water quality in coral reef zones, and looks into possible causes of destruction