Coral bleaching occurs when corals become heat-stressed enough to expel their primary source of food, the microalgae that live inside their cells. This leaves the coral looking as white as if they had been soaking in bleach.
Korallbleiking kemur fyri, tá korrallar gerast nóg hitatrýstir til at dríva teirra høvuðskeldu til mat, mikrotaran sum býr inni í kyknunum, út. Hetta ger at korrallurin sær so hvítur út, sum um hann var bloyttur í bleikingarevni.