Across
- 2. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
- 3. growth whose rate becomes ever more rapid in proportion to the growing total number or size.
- 6. Population density is a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density.
- 8. the envelope of gases surrounding the earth or another planet.
- 11. growth whose rate becomes ever more rapid in proportion to the growing total number or size.
- 12. the number of live births per thousand of population per year.
- 15. (of a substance or object) capable of being decomposed by bacteria or other living organisms.
- 16. fog or haze combined with smoke and other atmospheric pollutants.
- 18. El Niño is the warm phase of the El Niño–Southern Oscillation and is associated with a band of warm ocean water that develops in the central and east-central equatorial Pacific, including the area off the Pacific coast of South America.
- 20. the weather conditions prevailing in an area in general or over a long period.
- 22. the maintenance of a population at a constant level by limiting the number of live births to only what is needed to replace the existing population.
- 24. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere.
- 25. the number or quantity of people or things that can be conveyed or held by a vehicle or container.
Down
- 1. the factor that limits the reaction rate in any physiological process governed by many variables.
- 4. La Niña is a coupled ocean-atmosphere phenomenon that is the colder counterpart of El Niño, as part of the broader El Niño–Southern Oscillation climate pattern.
- 5. 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, chlorofluorocarbons, and other pollutants.
- 7. the act of leaving one's own country to settle permanently in another; moving abroad.
- 9. In logistic growth, a population's per capital growth rate gets smaller and ... this means that at their maximum growth rate, their population doubles each hour.
- 10. the process of making an area more urban.
- 13. A renewable resource is one that can be used repeatedly and does not run out because it is naturally replaced.
- 14. a layer in the earth's stratosphere at an altitude of about 6.2 miles (10 km) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
- 17. the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
- 19. A nonrenewable resource is a natural substance that is not replenished with the speed at which it is consumed.
- 21. the ratio of deaths to the population of a particular area or during a particular period of time, usually calculated as the number of deaths per one thousand people per year.
- 23. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light. It differs from normal oxygen (O2) in having three atoms in its molecule (O3).