This dissolves carbon dioxide and hides it away on the ocean floor as calcium carbonate.
As every schoolboy knows, if you drop calcium carbonate (limestone, for example) into acid, it dissolves.
Sea coral naturally contains calcium carbonate and possesses a porous architecture not unlike natural bone.
That is bad because many marine creatures rely on shells made of calcium carbonate to protect themselves.
The conference also gave him the opportunity to promote another Carbon Sciences venture: turning CO2 into precipitated calcium carbonate.
Stony corals are microscopic animals with an outer skeleton of calcium carbonate that form colonies and are responsible for reef-building.
In the process they also secrete calcium carbonate that becomes the basis for an external skeleton on which they sit.
In reefs, the structure is big lumps of calcium carbonate on which things grow and around which they graze and hunt.
The remainder will end up in salt ponds where various compounds -- sodium chloride, gypsum, calcium carbonate -- can be extracted and potentially commercialized.
Beachrock: ledges of rock formed within the body of the beach consisting of sand grains cemented by calcium carbonate and formed by chemical processes.
Geological history shows that anthozoans secrete their calcium carbonate skeletons more slowly during periods when there is a lot of carbon dioxide in the atmosphere.
It has developed a method to extract carbon dioxide from industrial emissions and bubble it through seawater to create calcium carbonate, a process that mimics the buildup of coral.
The problem is partly due to people collecting abandoned shells from beaches, although much of the marine life that makes those calcium carbonate shells is also increasingly threatened by ocean acidification.
Wrigley's new antacid gum, Surpass, launched in January, showed that gum coated with calcium carbonate relieves heartburn faster and for longer than tablets (helped by the alkalinity in saliva), but sales are poor.
Eclipse, which is meant to be sprayed on apples, cherries and other fruit four to ten times a season, is made with microcrystalline calcium carbonate--the nontoxic white powder that's on the outside of chewing gum.
The second sample is a piece of dolomite (a rock made of calcium magnesium carbonate).
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