Across
- 5. inversion - a weather condition in which warm air traps cooler air at the surface, preventing the dispersion of pollutants.
- 7. tide - a phenomenon caused by algal blooms that discolor the water and produce toxic effects on marine life.
- 8. fuel - a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
- 10. system - a small-scale sewage treatment system used in areas without centralized sewer systems.
- 13. source pollution - pollution that comes from many diffuse sources, such as runoff from agricultural fields or urban areas.
- 16. - water that has been used and contains impurities.
- 17. deposition - the deposition of acidifying substances from the atmosphere onto Earth's surface.
- 18. - the artificial application of water to land or soil to assist in the growth of crops.
- 19. hole - a region of depleted ozone in the stratosphere, typically over Antarctica.
- 20. air pollutant - a pollutant that forms in the atmosphere from chemical reactions involving primary pollutants, such as ozone or smog.
- 21. - the release of pollutants into the atmosphere.
- 22. agriculture - a method of farming that focuses on long-term environmental and economic sustainability.
- 23. bloom - a rapid increase in the population of algae in a body of water, often due to excessive nutrients.
Down
- 1. (CFCs) - a group of synthetic compounds used as refrigerants and propellants that contribute to ozone depletion.
- 2. Protocol - an international treaty designed to protect the ozone layer by phasing out the production of substances that deplete it.
- 3. eutrophication - the process by which excessive nutrients in a body of water lead to the depletion of oxygen and the death of aquatic organisms.
- 4. - the process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture practices.
- 6. air pollutant - a pollutant that is directly emitted into the air, such as carbon monoxide or sulfur dioxide.
- 9. pollution - pollution that comes from a single, identifiable source, such as a pipe or smokestack.
- 11. - a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
- 12. - the accumulation of salts in soil, typically as a result of irrigation.
- 14. agriculture - a form of agriculture that relies on crop rotation, green manure, compost, and biological pest control to maintain soil productivity and control pests.
- 15. - a microorganism that can cause disease.
- 17. pollution - the presence of harmful substances in the air, such as smog or particulate matter.
- 22. - a type of air pollution caused by a mixture of smoke and fog.