About 74% by mass of Earth's crust is composed of the two elements
A) oxygen and iron.
B) aluminum and iron.
C) oxygen and silicon.
D) silicon and aluminum.

Name: About 74% by mass of Earth's crust is composed of the two elements A) oxygen and iron. B) aluminum and iron. C) oxygen and silicon. D) silicon and aluminum.
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Quizplus · Accepted Answer

Oxygen and silicon are the two most abundant elements in the Earth's crust, making up about 74% of its mass. Oxygen constitutes approximately 46% and silicon about 28%.

About 74% by Mass of Earth's Crust Is Composed of the Two