Environment

2. Residue from wastewater treatment plant which are thick and muddy.
6. Branch of sciences that explain reactions and substances of matter and its changes.
7. Reusing materials to reduce waste which are promoting sustainability.
9. Process of something loses electrons such rust formation on metal.
11. Used water from homes and other outlets which are needed to be treat.
12. Surroundings or conditions in which person, animals or plant lives.

1. Harmful substances in the environment which can cause contamination to air, water or soil.
3. Treated wastewater released which can be discharged into a river or sea.
4. Process to clean or fix something such as water contamination.
5. Eco-friendly and long lasting which are able to maintained over time.
8. Community of living organisms and non-living things.
10. Unsafe situation or condition which can give potential danger and risk.