Keywords

3. releases energy in the form of radiation, which can be harmful
4. mixes waste water and sludge with large volumes of air
5. application of chemicals, such as chlorine, to disinfect and kill remaining germs
9. a process that starts with clearcutting and removal of the mountaintop forest, as none of the vegetation can survive this coal extraction process
14. a by-product of nickel and copper smelting
15. an industrial plant that purifies crude substances
16. These are large pools where the cyanide compounds (mixed in with crushed rock) break down in sunlight
17. the separation of a mechanical mixture, including removal of suspended solids, rocks, sand, and grit
18. chemicals seep into the ground and later enter a water supply
19. Waste gases produced by the refining process, such as methane or natural gas, are released and sometimes set aflame in a process
21. a process that involves the removal of long strips of overburden in areas where the material being mined is concentrated in veins
22. an area where garbage is disposed of and buried under layers of soil

1. used to separate different substances or fractions that makeup petroleum oil based on differences in their boiling points
2. surface material for surface mining
6. chemicals that come from pesticides
7. a large, low-lying area where seawater flows into
8. The solid matter that settles at the bottom of a sedimentation tank
10. chemical mixtures used to destroy pests that can harm crops
11. a process in which soluble parts of a substance are separated out
12. biological process involving aeration
13. a process that involves the removal of all materials in a large pit
20. a process that involves removing a large amount of soil and rock on the surface in order to access the valuable material
21. the liquid waste water from toilets, baths, showers,and sinks