1. The process of making air, water, or soil dirty is called…
2. Which of these is a renewable source of energy?
3. If we continue to cut down forests, many species … extinct.
4. To save water, you should turn … the tap while brushing your teeth.
5. The "greenhouse effect" leads to …
6. Much of the plastic waste … into the ocean every year.
7. An area where animals are protected in their natural habitat is a …
8. If people … more public transport, there would be less air pollution.
9. Which of the "3 Rs" means using something again instead of throwing it away?
10. Exhaust fumes from cars are a major cause of … in big cities.
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