MCQOPTIONS
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| 1. |
The total volume of water on Earth is estimated around: |
| A. | 1.386 billion km3 |
| B. | 13.86 billion km3 |
| C. | 138.6 billion km3 |
| D. | 1386 billion km3 |
| Answer» B. 13.86 billion km3 | |