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The two most abundant elements in Earth's continental crust are _____. oxygen and silicon Which major non-silicate rock forming mineral is the primary constituent of the rock limestone? calcite Which of the following is the least abundant of the eight rock forming elements that make up most of the continental crust? iron; oxygen; aluminum; calcium; magnesium
Miscellaneous Calcium Facts. 1  Calcium is the 5th most abundant element in the Earth's crust, making up 3.22% of the earth, air, and oceans. 2  Calcium is not found free in nature, but calcium compounds are common. Calcium is the main component of teeth and bones. 2  Calcium is the fifth most abundant element in the human body. 3  Approximately one third of the mass of the human body is calcium after all water is removed.