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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
a chemical element, atomic number 20, atomic weight 40.08. (See Appendix 6.) Calcium is the most abundant mineral in the body. In combination with phosphorus it forms calcium phosphate, the dense, hard material of the bones and teeth.