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Radioactive dating corals

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Often called "rainforests of the sea", shallow coral reefs form some of the most diverse ecosystems on Earth.They occupy less than 0.1% of the world's ocean surface, about half the area of France, yet they provide a home for at least 25% of all marine species, Paradoxically, coral reefs flourish even though they are surrounded by ocean waters that provide few nutrients.When I first got involved in the creationism/evolution controversy, back in early 1995, I looked around for an article or book that explained radiometric dating in a way that nonscientists could understand. Young-Earth creationists -- that is, creationists who believe that Earth is no more than 10,000 years old -- are fond of attacking radiometric dating methods as being full of inaccuracies and riddled with sources of error. All these methods point to Earth being very, very old -- several billions of years old.Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups.

Uranium 235 decay to lead has a half-life of 713 million years, so it is well suited to dating the universe.

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.

Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients.

C14 is continually being created and decaying, leading to an equilibrium state in the atmosphere.

When the carbon dioxide, containing C14 as well as stable C12 and C13, is taken in by plants it is no longer exposed to the intense cosmic ray bombardment in the upper atmosphere, so the carbon 14 isotope decays without being replenished.