Nature

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Across
  1. 2. is the process by which water changes from liquid to gas?
  2. 3. dioxide-11.What gas do humans exhale that plants need for photosynthesis?
  3. 5. is the longest river in the world?
  4. 8. is the layer of gases surrounding the Earth called?
  5. 9. natural phenomenon produces thunder and lightning
  6. 10. is the name of the frozen water falling from the sky in winter?
  7. 11. is the main source of energy for Earth?
  8. 13. -1. Q: What is the process by which plants make their own food using sunlight?
  9. 14. type of trees do not lose their leaves in autumn?
  10. 15. is the outer layer of the Earth called ?
  11. 16. is the name of the largest land animal?
Down
  1. 1. is the largest ocean on Earth?
  2. 4. do you call a scientist who studies plants?
  3. 6. is the name of a place where many different plants and animals live together?
  4. 7. kind of animal only eats plants?
  5. 12. do bees collect from flowers to make honey?