Across
- 4. acid rain can be reversed but it is very _____________ (pg116)
- 5. The _______________ level of carbon dioxide is the primary contributor to the rise in global temperatures in the past century (pg 114)
- 6. The human population reached 1 _________ by the 1800s. (pg105)
- 9. Human populations have fluctuated in the past mostly due to ______________conditions (pg 105)
- 10. When the number of humans grow beyond what the available resources can support (pg 109)
- 12. Acid rain can also cause metal to rust at a _______________ rate (pg116)
- 13. Gases react in the sunlight to produce a form of oxygen called ________________ (pg115)
- 15. a roll in decreasing the death rate (pg 106)
- 18. Smog can cause _____________ problems and diseases of the eyes and throat (pg115)
- 19. ______________ in public health and general living standards
- 20. The number of people who die per 1000 individuals is the ______________ rate (pg 106)
- 21. IN the ozone layer ______________ is constantly being made and destroyed in a cycle (page 119)
- 23. This is used to counter water shortages (pg110)
- 24. Air ___________ can be a big problem in areas where there are a lot of factories or people (pg114)
- 25. Carbon __________________ forms when fuels such as oil, gas, or wood are burned (pg117)
- 28. This forms when certain gases and chemicals react with sunlight. (pg115)
- 29. using resources ______________ their amount which is a problem for nonrenewable resources (pg109)
- 30. Under certain weather conditions called temperature ________________ the normal circulation of air is blocked (pg115)
- 31. Many years ago the main source of air pollution was the smoke being pumped out of ___________ (pg114)
- 32. The number of people who are born per 1000 individuals is the birth _____________ (pg106)
- 33. Earth provides many resources that humans rely on to live such as energy sources, minerals, water, trees, and ____________ (pg108)
Down
- 1. Every human being relies on fresh clean water to _________________ (pg 108)
- 2. It is up to individuals governments and international organizations to decide how to manage the imacts of a _____________ population (pg110)
- 3. Solar wind hydoelectric and geothermal energy produce only a small fraction of the ___________ emissions that the burning of fossil fuels generates (pg118)
- 4. the type of growth that happens very rapidly over time (pg 107)
- 7. No single method works in every situation, there are ______________ and costs to each (pg110)
- 8. The practice of using less of a resource so that it can last longer (pg110)
- 9. One way to reduce emissions is ________________ as well as biking or walking (page 118)
- 11. Precipitation that is more acidic than normal because of air pollution (pg116)
- 14. in the 1970s scientists discovered an area of sever ozone depletion or a ______________ in the ozone layer (page119)
- 15. Air pollution affects weather____________ and the climate can lead to illness and death (page118)
- 16. Some all electric vehicles produce _____________ emissions (page118)
- 17. Advances in ____________ lead to increased transportation
- 20. As the worlds population grows so does our ________________ for resources (pg 108)
- 22. Some sources of indoor air pollution include dust, ____________, and pet hair (pg 117)
- 26. These often contain carbon dioxide which is a pollutant (pg114)
- 27. new farming methods (pg 106)
- 29. Populations are limited by space and ________________ (pg 107)