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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
Silicates are the most widespread of the minerals. They are made up of oxygen and silicon the number one and number two most abundant elements in the earth's crust.By themselves they make up over 90% of the weight of the earthâs crust. Most rocks are composed mainly of this class of minerals.ilicates are the most widespread of the minerals. They are made up of oxygen and silicon the number one and number two most abundant elements in the earth's crust.