McqMate
| Q. |
The most abundant element is - |
| A. | Calcium |
| B. | Silicon |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» C. Oxygen | |
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Explanation: On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass. |
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