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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
8. The mineral quartz in rock A is composed of the two most abundant elements by mass in Earth's crust. These two elements are oxygen and (1) magnesium (2) lead (3) iron (4) silicon 9. Base your answer to the following question on the rock sample shown below.