2. Living things in our environment include … and … .

3. Non-living things in our environment include light, …, … , and soil.

4. Air, soil, and water are … resources. They can be replaced naturally by the environment.

5. Natural gas, …, and coal are the example non-renewable resources.

6. … fuels are formed from dead organisms which are buried under layers of earth for thousands of years.

7. Oil is processed in oil refineries to obtain petrol, …., and fuel for aeroplanes.

8. Many building materials occur naturally in the environment. These include wood, metals, …, sand, and mud.

9. People visit … environments to take in their beauty and enjoy the interaction with nature.

10. Plants need sunlight to make … .

11. The effect of … environmental changes can only be seen after a long period of time.

12. Soil erosion, global warming, …, and depletion of the ozone layer are examples of slow environmental changes.

13. CFCs is the ozone layer that slowly becoming thinner as a result of the use of gases. CFCs stands for … .

14. … environmental changes have huge effects on the environment that can be seen immediately.

15. Landslides, volcanic eruptions, …, and earthquakes are examples of rapid environmental changes.

16. Good environmental changes help to preserve natural resources such as …, soil, and water.

17. … … are used for protecting and restoring soil fertility.

18. Heat released from a volcano can be changed to useful energy. This energy is used to generate … .

19. … environmental changes cause damage to wildlife, changes to climate, and loss of lives and property.

20. … makes the water cloudy and sunlight cannot reach aquatic plants and animals.