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Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, ... Calcium metal is found in some drain cleaners, ...
The US Institute of Medicine (IOM) established Recommended Dietary Allowances (RDAs) for calcium in 1997 and updated those values in 2011. [6] See table. The European Food Safety Authority (EFSA) uses the term Population Reference Intake (PRIs) instead of RDAs and sets slightly different numbers: ages 4–10 800 mg, ages 11–17 1150 mg, ages 18–24 1000 mg, and >25 years 950 mg. [10]
Magnesium and calcium are very common in the Earth's crust, being respectively the fifth and eighth most abundant elements. None of the alkaline earth metals are found in their elemental state. Common magnesium-containing minerals are carnallite, magnesite, and dolomite. Common calcium-containing minerals are chalk, limestone, gypsum, and ...
In a study of 542,000 women, consuming the amount of calcium found in a glass of milk a day was linked to a lower colorectal cancer risk Foods such as figs and tofu also contain the mineral.
Calcium makes up 920 to 1200 grams of adult body weight, with 99% of it contained in bones and teeth. This is about 1.5% of body weight. [2] Phosphorus occurs in amounts of about 2/3 of calcium, and makes up about 1% of a person's body weight. [10]
Marine biogenic calcification is the production of calcium carbonate by organisms in the global ocean.. Marine biogenic calcification is the biologically mediated process by which marine organisms produce and deposit calcium carbonate minerals to form skeletal structures or hard tissues.
A new study has found that consuming foods and drinks rich in calcium is correlated with a lowered risk for colorectal cancer. Researchers also further solidified the known risk of alcohol and red ...
Abundance (atom fraction) of the chemical elements in Earth's upper continental crust as a function of atomic number; [5] siderophiles shown in yellow Graphs of abundance against atomic number can reveal patterns relating abundance to stellar nucleosynthesis and geochemistry.
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