taking care of resources

2. Synonym of waste or trash.
7. Leftovers of man-made materials.
8. To contaminate or throw garbage to the floor, water or air.
12. Things that take a long time to decompose.
14. Break down in very small and simpler pieces that finally mixes with the soil.
16. Resources that cannot be renewed in a natural way after they have been used up.
18. Something that remains after the rest has been used.
19. Something that is used up completely.
20. Elements or things needed by humans.

1. Waste material.
3. Materials that do not come directly from nature but are processed.
4. Things that are able to decompose naturally in a short amount of time.
5. Material that is eliminated as no longer useful.
6. Objects or materials made by humans.
9. Not used in an appropriate way.
10. To cut a whole forest without caring.
11. Place where the trash or waste of a town is gathered or stored.
13. Material that after being used or extracted, have the capacity to regenerate.
15. Leftovers of living things.
17. Materials that humans take from nature.