1. | Where is the Earth located in the Solar System? |
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2. | How old is the Earth? |
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3. | Which is the largest ocean on our planet? |
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4. | Which is the largest island? |
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5. | Which extinct bird lived on Mauritius? |
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6. | How old are the oldest trees? |
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7. | Which is the fastest land animal? |
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8. | What is the percentage of oxygen in the Earth's atmosphere? |
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9. | What percentage of the Earth's surface is covered in water? |
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10. | Which is the longest mountain range on the planet? |
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11. | Which is the highest waterfall in the world? |
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12. | Who was the first explorer to reach the South Pole? |
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13. | What do you call the variation of life forms within an ecosystem? |
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14. | Do dolphins have teeth? |
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15. | Above what altitude are travelers considered to be astronauts? |
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