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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
Answers. Best Answer: The most abundant element by weight is oxygen. The most common minerals that form the rocks in Earth's crust are quartz (silicon dioxide, 52Â½% oxygen) and the feldspar group, which are silicate minerals containing more oxygen by weight than any other elements. Hope this answers your question.. Source(s): college geology.