Crossword Quiz

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Across
  1. 2. The layer of gases surrounding the Earth.
  2. 4. Substances used to eliminate pests that harm crops and plants
  3. 7. The introduction of harmful substances into the environment
  4. 9. The act of preserving and protecting the environment and natural resources.
  5. 10. The clearing of trees, transforming a forest into cleared land.
Down
  1. 1. The natural home or environment of an animal or plant.
  2. 3. The process by which green plants make their food using sunlight.
  3. 5. Organisms that live in water.
  4. 6. The process of recycling organic waste into fertile soil.
  5. 8. A species at risk of extinction