Across
- 2. a group of people living in a area
- 7. the south polar region
- 8. the physical world including plats, animals and landscape
- 12. vegetation
- 13. a biological community of interacting organisms and their physical environment
- 15. a hundredth of a whole
- 16. underrate
Down
- 1. oceans
- 3. the introduction of harmful substance into environment
- 4. small arthropod animals
- 5. lessen the strength
- 6. effect
- 9. take in, soak up
- 10. problems
- 11. the degree of heat present in an object
- 14. a hundred years