Pronunciation of the English word calcium.
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1. | Calcium is absent from his diet. | |
2. | Beryllium, magnesium, calcium, strontium, barium and radium are alkaline earth metals. | |
3. | Spinach is a rich source of iron and calcium. | |
4. | When choosing mineral water, we should prefer water that is rich in calcium and magnesium, but low in sodium. | |
5. | Natural mineral water contains calcium, magnesium, sodium, potassium as well as nitrate. | |
6. | Calcium is not an alkali metal. | |
7. | Milk is a good source of calcium. | |
8. | The famous white-sand beaches of Hawaii, for example, actually come from the poop of parrotfish. The fish bite and scrape algae off of rocks and dead corals with their parrot-like beaks, grind up the inedible calcium-carbonate reef material (made mostly of coral skeletons) in their guts, and then excrete it as sand. | |
9. | Most structures that we call "coral" are, in fact, made up of hundreds to thousands of tiny coral creatures called polyps. Each soft-bodied polyp—most no thicker than a nickel—secretes a hard outer skeleton of limestone (calcium carbonate) that attaches either to rock or the dead skeletons of other polyps. | |
10. | Decreases in carbonate ions can make building and maintaining shells and other calcium carbonate structures difficult for calcifying organisms such as oysters, clams, sea urchins, shallow water corals, deep sea corals, and calcareous plankton. |