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25 Cards in this Set
- Front
- Back
Source of the Colorado River water |
Snow melt in the Rocky Mountains |
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Percentage of the Earth covered by water |
71% |
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Percentage of the Earth's water supply that is liquid water |
0.024% |
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Water Hotspot |
An area with high competition for scarce water resources |
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Water table |
Moves down in dry weather and up in wet weather |
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Zone of saturation |
The area where the spaces in the soil and rock are completely filled with water |
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Aquifer |
A geological layer consisting of underground caverns and porous layers of sand, gravel, or bedrock that trap groundwater |
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Watershed |
The land from which surface water drains into a particular lake, river, or other body of water |
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The majority of freshwater withdrawn is for |
Agriculture |
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Virtual Water |
Indirectly used water, used to produce food and other products |
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The percentage of China's major cities are already facing water shortages |
67% |
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Subsidence |
The land above an aquifer sinks due to overdrafting |
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Reverse osmosis |
A method of desalination that involves using high pressure to force saltwater through a membrane filter with pores small enough to remove salt |
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Distillation |
A method of desalination that involves heating saltwater until it evaporates, leaving salt behind |
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Saltwater intrusion |
Overdrafting an aquifer to the point that salt water is pulled into the freshwater aquifer from local wetlands |
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Advantages of dams and reservoirs |
Produce electricity, supply water for irrigation, provide recreational areas, and reduce downstream flooding |
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Disadvantages of dams and reservoirs |
Displaces people, disrupts migration patterns, reduces nutrients downstream and water loss through evaporation |
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California Water Project |
The world's largest water transfer project |
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Colorado River Basin |
Supplies water to the driest states in the US. |
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Gravity Flow Irrigation |
Unlined ditches are flooded with water which is absorbed by soil and crops |
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Drip Irrigation |
The most efficient means of water delivery to crops |
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Center Pivot Irrigation |
Uses pumps to spray water directly onto crops |
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Flood prevention |
Conserve and restore wetlands |
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Major cause of flooding |
Destroying vegetation |
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Aral Sea |
A water transfer project gone wrong, resulting in high saline water, decreased biodiversity, and water shortages |