Across
- 4. warming that results when solar radiation is trapped by the atmosphere
- 7. pollution of the atmosphere
- 8. a gas that contributes to the greenhouse effect by absorbing infrared radiation
Down
- 1. undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
- 2. that can be renewed or extended
- 3. pollution of the water in rivers and lakes
- 4. an increase in the average temperature of the earth's atmosphere
- 5. the totality of surrounding conditions
- 6. a layer in the stratosphere that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
- 9. cause to repeat a cycle