Taking care of resources

5. Materials that do not come directly from nature but are processed.
7. To contaminate or throw garbage to the floor, water or air.
8. Leftovers of man-made materials.
10. Place where the trash or waste of a town is gathered or stored.
12. Break down in very small and simpler pieces that finally mixes with the soil.
13. Things that are able to decompose naturally in a short amount of time.
14. Objects or materials made by humans.
17. Something that is used up completely.
18. Materials that humans take from nature.
19. Not used in an appropriate way.
20. Things that take a long time to decompose.

1. Synonym of waste or trash.
2. Leftovers of living things.
3. Material that is eliminated as no longer useful.
4. To cut a whole forest without caring.
6. Something that remains after the rest has been used.
9. Material that after being used or extracted, have the capacity to regenerate.
11. Resources that cannot be renewed in a natural way after they have been used up.
15. Waste material.
16. Elements or things needed by humans.