Multiple choice

Which are the two most common elements in the earth's crust?

  1. Nitrogen and oxygen

  2. Nitrogen and silicon

  3. Carbon and oxygen

  4. Silicon and oxygen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Silicon (28%) and oxygen (46%) are the two most abundant elements in Earth's crust by mass, combined primarily as silicates and silica. Together they account for about 75% of the crust's composition. Nitrogen is mainly in the atmosphere, while carbon is present but not in crustal abundance.

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