Across
- 2. the number of live births per thousand of population per year
- 4. is surface runoff of precipitation created by urbanization.
- 8. allows genes to be transferred from one bacterium carrying the factor to another bacterium lacking the factor by conjugation
- 9. the act of leaving one's own country to settle permanently in another; moving abroad
- 10. a substance that pollutes something, especially water or the atmosphere
- 13. capable of being decomposed by bacteria or other living organisms.
- 17. is a coupled ocean-atmosphere phenomenon that is the colder counterpart of El Niño
- 18. a layer in the earth's stratosphere at an altitude
- 19. the natural home or environment of an animal, plant, or other organism
- 20. all the inhabitants of a particular town, area, or country
- 21. the number or quantity of people or things that can be conveyed or held by a vehicle or container
- 23. a variable of a system that, causes a noticeable change in output or another measure of a type of system
- 24. the weather conditions prevailing in an area in general or over a long period.
- 25. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
Down
- 1. the process of making an area more urban.
- 3. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere
- 5. the ratio of deaths to the population of a particular area or during a particular period of time
- 6. the envelope of gases surrounding the earth or another planet.
- 7. fog or haze combined with smoke and other atmospheric pollutants
- 11. a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide
- 12. the action of clearing a wide area of trees.
- 14. the action of coming to live permanently in a foreign country
- 15. an irregularly occurring and complex series of climatic changes affecting the equatorial Pacific region and beyond every few years
- 16. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties
- 22. are hardy species which are the first to colonize barren environments