Multiple choice

Which one of the following elements is the most abundant in Earth's crust?

  1. Carbon

  2. Sulphur

  3. Oxygen

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen makes up about 46-47% of Earth's crust by mass, making it the most abundant element. Silicon comes second at ~28%, while carbon and sulphur are much less abundant.

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