Much of the world’s fresh water is unavailable to us because: 1 2 3 4 25% 25% 25% 25% 1. It is in deep and inaccessible aquifers 2. It exists in the form of water vapor 3. It is mixed with saltwater 4. It is locked up in ice caps or
Dec 23, 2015
Much of the world’s fresh water is unavailable to us because:
1 2 3 4
25% 25%25%25%1. It is in deep and
inaccessible aquifers
2. It exists in the form of water vapor
3. It is mixed with saltwater
4. It is locked up in ice caps or glaciers
About 2/3 of the world’s annual runoff is lost by _____ and is not available for human
use.
1 2 3 4
25% 25%25%25%1. Evaporation
2. Percolation into the ground
3. Pollution of the water supply
4. Seasonal floods
Most water is withdrawn from surface waters and aquifers for:
1 2 3 4
25% 25%25%25%1. Drinking water
2. Industrial manufacturing
3. Irrigation of crops
4. Cooling power plants
Porous, water-saturated layers of sand, gravel, or bedrock through which groundwater flows make up a(n):
1 2 3 4
25% 25%25%25%1. Aquifer
2. Watershed
3. Zone of aeration
4. Eutrophic zone
One trend in managing water resources is:
1 2 3 4
25% 25%25%25%1. Privatization
2. Government seizure of privately-held water supplies
3. Public utility ownership
4. None of the choices
True or false? Innovative conservation strategies assure California of an adequate
water supply for at least this century.
1 2
50%50%1. False
2. True
Diversion of water from the Aral Sea has led to:
1 2 3 4
25% 25%25%25%1. Decrease in its salinity
2. Increased crop yields in the neighboring areas
3. Extinction of native fish species
4. More moderate temperature and increased rain
Which of the following is not a stated means of preventing groundwater depletion?
1 2 3 4
25% 25%25%25%1. Reduce stream flow
levels
2. Ban new wells
3. Tax water pumped from wells near surface water
4. Switch to less water-intensive crops
Which is the most efficient irrigation technique?
1 2 3 4
25% 25%25%25%1. Gravity flow
through ditches
2. Center pivot sprinkler systems
3. Surge valves
4. Drip irrigation systems
_____ is reclaimed water from sinks, tubs, and washers.
1 2 3 4
25% 25%25%25%1. Sludge
2. Brown water
3. Gray water
4. Treated water
The removal of vegetation, especially on hillsides increases the risk of:
1 2 3 4
25% 25%25%25%1. Salinization
2. Groundwater overdrafts
3. Saltwater intrusion
4. Flooding
From an environmental viewpoint, the best approach to reducing flood risks is:
1 2 3 4
25% 25%25%25%1. Floodplain
management
2. Channelization
3. Artificial levees
4. Flood control dams
Which of the following is not one of the causes of water scarcity?
1 2 3 4
25% 25%25%25%1. Dry climate
2. Erosion
3. Desiccation
4. Drought
Which of the following is not a stated concern about China’s Three Gorges Dam?
1 2 3 4
25% 25%25%25%1. The reservoir will force
the displacement of over a million people
2. The reservoir will flood important archaeological sites
3. The dam may not be able to withstand the impact of an earthquake
4. The dam will increase China’s dependence on coal
Which of the following is not a main factor in water scarcity?
1 2 3 4
25% 25%25%25%1. Dry climate
2. Increased damming of rivers and building of reservoirs
3. Drought
4. Too many people using reliable water source
True or false? Since the 1960’s the Aral Sea in the former Soviet Union is going dry as a result of a large scale water transfer project.
1 2
50%50%1. True
2. False