the.com/coral reef

A trillion tiny animals build a city skyline, then die to become its foundation.

means A massive underwater structure built from the calcium carbonate skeletons of colonial marine polyps, layered up over centuries into a living reef ecosystem.

from 'Coral' traces back through Old French and Latin 'corallium' to Greek 'korallion' — the ancient name for the red Mediterranean coral prized for jewelry, though the word's deeper roots before Greek are uncertain, possibly from a pre-Greek or Semitic source. 'Reef' comes from Old Norse 'rif,' meaning rib — sailors seeing a ridge of rock or coral breaking the sea's surface like a rib poking through skin. Neither word originally meant the whole bustling ecosystem; they fused over centuries of sailors and naturalists describing what they found just under the waterline.

what it is
Living animals that secrete their own skeletons
biodiversity
Houses a quarter of all marine species
footprint
Covers less than 1% of the ocean floor
vulnerability
Bleaches white when stressed, then often starves
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