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29 Cards in this Set
- Front
- Back
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Nubian Sandstone |
= old water (50 000 km^3) - Libya pipes 145-65 millioon years ago largest fossil-water reserve equivalent to flow of water in nile |
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Great man-made river project |
6.5 m^3 water/day |
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water is how much % desalinization |
10% |
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How much % fresh water is great lakes ? |
18% |
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how much outflow in great lakes ? |
1% |
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how many provinces /states surround it |
1 province 8 states |
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depth of superior |
406m |
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volume of superiror |
12,100km^3 |
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depth of erie |
64m |
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volume of erie |
484 |
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population of erie |
11 682 000 |
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retreating glaciers how many years ago? |
10 000 |
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new chemicals in eco system? what and what years? |
PCB- 1920s DDTs- 1940s Phosphorus- 1950s (eutriphication) |
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when was the great lakes quality agreement? |
1972 |
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what year to restore unimpaired use of ecosystem by all living components using indicator organisms? |
1987 |
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how long ago was precambrian |
3 billion |
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how long ago was paleozoic (that created hard rocks w/ calcium carbonate) |
600-230 million years ago |
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Pleistocene (glaciers) |
2.6 million ago- 11 700 |
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how long ago did native people explore |
10K years ago |
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increase in population in what year |
1792-1800 (300% increase) 20K to 60K |
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first sulphate process paper mill on where and when? |
welland canal in 1860s (sulphate broke down wood) |
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what are the commonly most shipped now? |
irone ore, coal and grain |
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when was the largest harvests in fishing recorded? |
1889 and 1899 |
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when was the commercial fishery over? |
1950s |
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were many recreational activities public or commercial/ |
commercial |
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contaminate levels fallen ince what year? |
1960s |
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whats the main industry |
construction manufacturing trade |
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what did they use to stop waterborne disease? |
chlorine |
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how much 5 P loading in Lake Michigan? |
20%
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