Of the 89 naturally occurring elements, how many are needed to account for 99.7 percent of the mass of Earth's crust?
A) 42
B) 21
C) 12
D) 10

Name: Of the 89 naturally occurring elements, how many are needed to account for 99.7 percent of the mass of Earth's crust? A) 42 B) 21 C) 12 D) 10
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Question

Quizplus · Accepted Answer

Only 12 of the naturally occurring elements make up 99.7% of the Earth's crust, with the most abundant being oxygen, silicon, aluminum, and iron.

Of the 89 Naturally Occurring Elements, How Many Are Needed