| Have you ever wondered why normal limestone is colorless, but a coral reef, though made of limestone, is the most colorful place on Earth? In a recent National Geographic magazine, this question was answered. It all depends on the amount of sunshine reaching the coral. The less sun a reef has, the less colorful it will be. That is why coral gets duller as you go deeper down. It's like a rainbow when there is sunshine and rain at once, the light through the water reflects beautiful and brilliant colors. |