Across
- 2. density the number of people per unit of area, usually quoted per square kilometer or square mile
- 5. Factor anything that constrains a population's size and slows or stops it from growing
- 8. Rate total number of children born or likely to be born to a woman in her life time
- 9. capable of being decomposed by bacteria or other living organisms.
- 11. and is a contraction of the words smoke and fog to refer to smoky fog; its opacity, and odor
- 13. natural events Natural disaster
- 15. a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.
- 18. resources hydropower, geothermal power, wind energy, and solar energy.
- 19. Growth growth whose rate becomes ever more rapid in proportion to the growing total number or size.
- 22. long-term average of weather, typically averaged over a period of 30 years
- 23. warming the long-term rise in the average temperature of the Earth's climate system.
Down
- 1. Capacity the number or quantity of people or things that can be conveyed or held by a vehicle or container.
- 3. the action of coming to live permanently in a foreign country.
- 4. the number of live births per thousand of population per year.
- 6. population shift from rural areas to urban areas, the gradual increase in the proportion of people living in urban areas, and the ways in which each society adapts to this change.
- 7. is the worldwide sum of all ecosystems. It can also be termed the zone of life on Earth, a closed system, and largely self-regulating.
- 10. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere.
- 12. population growth 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.
- 14. Renewable resources substance that is being used up more quickly than it can replace itself. Its supply is finite. Most fossil fuels, minerals, and metal ores
- 16. Nina occurs when sea surface temperatures in the central Pacific Ocean drop to lower-than-normal levels.
- 17. growth takes place when a population's per capita growth rate decreases as population size approaches a maximum imposed by limited resources, the carrying capacity
- 19. 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.
- 20. the act of leaving one's own country to settle permanently in another
- 21. 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.
- 24. 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).