| Answer | Crossword Clue |
|---|---|
| ARGON | About 1 percent of the Earth's atmosphere |
| ARGON | About 1 percent of the atmosphere |
| LAND | About 30 percent of the earth's surface |
| OCEAN | About 70 percent of the earth's surface |
| ACIREMA | Aptly, about 5 percent of the Earth's surface |
| ASIA | It has about 60 percent of the earth's population |
