Question

Oxygen and silicon makes up what percentage of the Earth crust.

A) 57% B) 98.5% C) 75% D) 50%

Answer 1

the answer is C

explanation

this is because the oxygen makes up 46.1%of the earth's surface while silcon is 28.5% and the question says "what makes up" which means you should add them and it becomes 74.6% which Is approximately 75%