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* 1. Who raised awareness of climate change by making a zero-carbon trip from Europe to the United States?

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* 2. Which of the world's oceans is the deepest, with a maximum depth of 36,037 feet?

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* 3. How long does it take for a plastic bag to decompose?

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* 4. Which of the following types of energy are renewable? (Choose all that apply.)

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* 5. What ecosystem is home to 40% of Earth's species but takes up only 6% of its land surface?

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* 6. Approximately how much plastic does the average human eat in their lifetime?

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* 7. What are some of the issues causing the destruction of coral reefs? (Choose all that apply.)

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* 8. Which mountain range is home to the world's second-highest peak behind Mount Everest?

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* 9. These organisms are responsible for producing up to 80% of the Earth's oxygen.

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* 10. In what year was Earth Day first celebrated?

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