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| 6283126240 | aquifers | water-holding rocks that provide millions of wells with steady flows of water | 0 | |
| 6283126241 | atmosphere | blanket of gases surrounding the Earth and locate 350 miles | 1 | |
| 6283127159 | global warming | an enhances greenhouse effect in the Earth's atmosphere | 2 | |
| 6283130061 | acid rain | rainwater that damages plant and animal life caused by sulfur | 3 | |
| 6283130062 | oxygen cycle | human acitivty consume atmospheric oxygen and produce carbondioxide | 4 | |
| 6283131907 | deforestation | clearing of a forests to harvest wood | 5 | |
| 6283131908 | soil erosion | waering away of the land surface by wind and moving water | 6 | |
| 6283134698 | sanitary landfills | sites for non-hazardous soild waste that is spreaded in layers | 7 | |
| 6283138163 | toxic waste | causing danger from chemicals | 8 | |
| 6283138164 | radioactive waste | raditaton from nuclear power plants | 9 | |
| 6283139585 | biodiversity | variety of plants and animal species | 10 | |
| 6283141330 | ozone layer | acts like a filter fro sun's urays | 11 | |
| 6283144423 | Vienna Convention for the protection of the Ozone Layer | convention aimed at adressing the issue of ozonde depletion in 1985 | 12 | |
| 6283146651 | montreal protocol | an internation agreemenet (EU) redcuction og chlorofluocarbons of 50 percent of 2000s | 13 | |
| 6283184963 | soild waste | non-liquid, from garabage-to sewage | 14 |
