Across
- 4. A type of natural resource that can be replenished or takes a rather short period of time for nature to produce to sustain the rate of consumption.
- 7. the weather conditions prevailing in an area in general or over a long period.
- 8. fog or haze combined with smoke and other atmospheric pollutants.
- 10. 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.
- 11. an irregularly occurring and complex series of climatic changes affecting the equatorial Pacific region and beyond every few years, characterized by the appearance of unusually warm, nutrient-poor water off northern Peru and Ecuador, typically in late December.
- 14. fresh invigorating air, especially that blowing onto the shore from the sea.
- 16. caused by nature, such as an earthquake or flood, in which there is a lot of suffering, damage, or death.
- 21. the number of live births per thousand of population per year.
- 22. the process of making an area more urban.
- 23. the number of people, other living organisms, or crops that a region can support without environmental degradation.
- 25. occurs when the growth rate decreases as the population reaches carrying capacity.
Down
- 1. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
- 2. the action of coming to live permanently in a foreign country.
- 3. number of live births per 1000 women between the ages of 15 and 44 years.
- 5. a resource of economic value that cannot be readily replaced by natural means at a quick enough pace to keep up with consumption.
- 6. the envelope of gases surrounding the earth or another planet.
- 9. a variable of a system that, if subject to a small change, causes a non-negligible change in an output or other measure of the system.
- 12. the act of leaving one's own country to settle permanently in another; moving abroad.
- 13. growth whose rate becomes ever more rapid in proportion to the growing total number or size.
- 15. 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.
- 17. a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density.
- 18. capable of being decomposed by bacteria or other living organisms.
- 19. 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.
- 20. a cooling of the water in the equatorial Pacific, which occurs at irregular intervals, and is associated with widespread changes in weather patterns complementary to those of El Niño, but less extensive and damaging in their effects.
- 24. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere.