Across
- 4. layer of gases that surround the earth
- 6. increase in the proportion of people living in towns and cities
- 8. When talking about energy sources, one that is not depleted when used
- 10. close look at the links between people and the natural and social world.
Down
- 1. materials occurring naturally in our environment from which we can make things for economic gain
- 2. The surroundings or conditions in which a person, animal, or plant lives.
- 3. A gradual increase in the overall temperature of the earth’s atmosphere attributed to an increase in carbon dioxide and other pollutants
- 5. presence in or introduction into the environment of a substance which has harmful or poisonous effects
- 7. A colorless and odorless gas that is life-supporting
- 9. weather conditions in an area over a period of time