environment

2. The invisible gaseous substance surrounding the earth
9. Gases that trap heat from the Sun in the earth's atmosphere are called ____.
10. Resources are called ____ when they can be can replenished at the rate they are used in.
11. A violent natural disaster caused by severe thunderstorms.
12. The only invertebrates (animals without backbones) with wings.
13. A term that describes the role an organism plays in a community.
15. The rise and fall of the sea that happens twice everyday.

1. The regions of the surface and atmosphere of the earth occupied by living organisms.
3. The most abundant gas in the atmosphere
4. A gas that plant and tress release into the air
5. Contamination of air, water or soil with substances that can cause harm to human health or environment
6. A bird that lays the largest egg.
7. A microscopic fungus consisting of single oval cells
8. The process of minimising waste by recovering materials and transforming them into new products.
14. The study of organisms and how they interact with the environment around them