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