As the silica content varies from less than 40% to more than 70% there is a systematic__________ .

Question

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As the silica content in rocks increases, there is typically a decrease in calcium, magnesium, and iron, which are heavier elements, and an increase in lighter elements such as sodium and potassium. This is because rocks with higher silica content tend to be more felsic, characterized by lighter minerals.

As the Silica Content Varies from Less Than 40% to More