NATURE

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Across
  1. 4. is concern for the people of Africa
  2. 6. is very important for plant growth
  3. 7. of humanity and insects
  4. 8. covers 71% of the earth's surface
  5. 11. is changeable
  6. 14. is one of the biggest problems on earth
  7. 15. warming is very dangerous for our planet
  8. 16. of global warming
  9. 17. are very important for us and they are hardworking
Down
  1. 1. is forming over the oceans in tropical areas
  2. 2. is a long and fast wave
  3. 3. keeps us alive
  4. 5. is interested and develops new things in science
  5. 9. is not a fish but mammal
  6. 10. we make every day
  7. 11. can be in group or alone
  8. 12. days are very warm
  9. 13. is cunning
  10. 14. must be watered every day
  11. 15. must not be dumped in nature