science

7. Decay process in the presence of air, water
and __________.
soil
germs
microorganism

8. Material that came from a
___________________ undergo decay.
living thing
non-living thing
thing

9. _________________ are the small living
things that cannot be seen with our
naked eye.
Microorganisms
Germs
Virus

10. _______________ are natural combustible
materials like coil, air and natural gas.
Fossil fuel
Natural fuel
Nuclear fuel

11. ____________________ is defined as how fast
materials decay.
Decay rate
Decay speed
Speed

12. Decay slows down because of the
___________________ in the food.
preservatives
additives
food coloring

13. Fruits and vegetables are examples of
____________________.
non-living things
biodegradable materials
waste

14. _______________________ are
examples of non-biodegradable
materials.
Plastics
Fruits
Woods

15. In proper waste disposal, one must
practice the ______________.
3R
2R
1R

16. _______________ means reducing or
lessening the production of waste material
by choosing the products to use.
Reduce
Reuse
Recycle