Across
- 4. density- a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density.
- 8. resources- A non-renewable resource is a resource of economic value that cannot be readily replaced by natural means at a quick enough pace to keep up with consumption.
- 13. the process of making an area more urban.
- 15. resources- A renewable resource is a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale
- 18. all the organisms of the same group or species, which live in a particular geographical area.
- 19. rate- 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. species- hardy species which are the first to colonize barren environments or previously biodiverse steady-state ecosystems that have been disrupted, such as by fire.
- 21. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light.
- 22. Nino- 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.
- 23. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere.
Down
- 1. succesion- Secondary succession occurs in areas where a community that previously existed has been removed
- 2. warming- 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.
- 3. the number of live births per thousand of population per year.
- 5. the envelope of gases surrounding the earth or another planet.
- 6. (of a substance or object) capable of being decomposed by bacteria or other living organisms.
- 7. the natural home or environment of an animal, plant, or other organism.
- 9. the act of leaving one's own country to settle permanently in another; moving abroad.
- 10. the action of coming to live permanently in a foreign country.
- 11. succesion- one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited
- 12. capacity- the number of people, other living organisms, or crops that a region can support without environmental degradation.
- 14. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
- 16. factor- a variable of a system that, if subject to a small change, causes a noticeable change in an output or other measure of a type of system.
- 17. the weather conditions prevailing in an area in general or over a long period.
- 21. layer- 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.