World Science Day

3. Capable of being broken down or decomposed by natural biological processes.
4. Shallow body of water located alongside a coast.
5. The release or discharge into the air of pollutant substances such as gas or smoke.
8. Destruction of forests to make land for agriculture.
11. Rain mixed with sulphuric, nitric and other acids formed by gases released into the atmosphere when fossil fuels are burned.
12. A large natural stream of water.
15. The mouth of a large river, where the tide meets the river.
17. Fuels such as oil, coal and natural gas.
18. An area designated to receive household garbage, solid waste and construction debris.
20. A colourless, odourless reactive gas which is an essential component for any breathing gas.

1. A gradual warming of the earth’s surface temperature reportedly caused by the emission of gases that trap the sun’s heat in the earth’s atmosphere.
2. Gases that trap the heat of the sun in the earth’s atmosphere, producing the greenhouse effect.
6. Protecting, maintaining or improving natural resources, to keep them safe from destruction or degradation and conserve them for future generations.
7. A place on the coast where vessels may find shelter.
9. The surroundings and external conditions that affect the growth and development of living things.
10. Large body of salt water that surround a continent.
13. The process of minimizing waste by covering materials and transforming them into new products.
14. Contamination of the air, water or soil with substances that can cause harm to human health or the environment.
16. Location where garbage, rubbish or waste is taken and just dumped, without environmental controls.
19. A large body of water surrounded by land on all sides.