UNIT 4 : LIFE ON EARTH

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Across
  1. 1. Animals that hunt other animals for food
  2. 6. A person who works to protect the environment
  3. 9. A layer of gases surrounding Earth that supports life
  4. 12. A wide variety of life forms on Earth
  5. 14. The natural world, including plants, animals, and landscapes
  6. 16. A living thing that produces its own energy from sunlight
  7. 18. A change in climate patterns over time
  8. 20. All the plants and animals living in a specific environment
Down
  1. 2. A species that is at risk of disappearing forever
  2. 3. A sudden and dramatic decrease in animal or plant populations
  3. 4. A type of plant that provides oxygen and absorbs carbon dioxide
  4. 5. A person who studies animals in their natural habitats
  5. 7. The process by which plants make food using sunlight
  6. 8. A place where an animal or plant normally lives
  7. 10. A large mammal that is a symbol of conservation efforts
  8. 11. A group of animals or plants that are similar and can reproduce
  9. 13. The destruction of forests, often for agriculture
  10. 15. A large natural stream of water flowing to the sea
  11. 17. An area of land where few plants or animals can survive due to lack of water
  12. 19. Natural resources that can be replaced, such as wind or solar power