Water Problems and Solutions - AP Environmental Science
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What percentage of the Earth's water is accessible and suitable for human use?
What percentage of the Earth's water is accessible and suitable for human use?
of the Earth's surface is water, but only 
is fresh water. Considering just the fresh water, only about 
is accessible to humans in the form of lakes, rivers, and other drinking sources. That is only .007% of the Earth's water. This is the basis for the clean water crisis that faces Earth's population.
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The current drought has seriously affected farmers in California. Which of the following is NOT something a farmer would want to do to conserve water?
The current drought has seriously affected farmers in California. Which of the following is NOT something a farmer would want to do to conserve water?
Seawater is not fit for use in agriculture. An excess of salt in a field results in water being drawn from plant roots due instead of the other way around. Spartans salted the orchards of their enemies to cripple their civilizations; one should not irrigate with seawater if one's intent is to grow crops.
Seawater is not fit for use in agriculture. An excess of salt in a field results in water being drawn from plant roots due instead of the other way around. Spartans salted the orchards of their enemies to cripple their civilizations; one should not irrigate with seawater if one's intent is to grow crops.
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What proportion of the world population do not have access to clean drinking water?
What proportion of the world population do not have access to clean drinking water?
750 million people in the world do not have access to clean drinking water. The total world population is about 7 billion, meaning every one in nine people do not have access to clean drinking water.
750 million people in the world do not have access to clean drinking water. The total world population is about 7 billion, meaning every one in nine people do not have access to clean drinking water.
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Which of the following would be an example of non-point source water pollution?
Which of the following would be an example of non-point source water pollution?
A point-source discharge is when pollutants are entering the watershed through an identifiable source, such as a drainage pipe from a factory. Water contamination from agricultural runoff is typically not a point-source because in a largely agrarian region, there are many farms contributing to the pollution but no specific point-source from which the pollutants enter the watershed. Agricultural pollutants typically enter the watershed either by leeching from the soil or through above-ground runoff.
A point-source discharge is when pollutants are entering the watershed through an identifiable source, such as a drainage pipe from a factory. Water contamination from agricultural runoff is typically not a point-source because in a largely agrarian region, there are many farms contributing to the pollution but no specific point-source from which the pollutants enter the watershed. Agricultural pollutants typically enter the watershed either by leeching from the soil or through above-ground runoff.
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Which of the following best describes greywater?
Which of the following best describes greywater?
Greywater typically includes all household sources of wastewater, with the exception of toilets. Greywater can be used to irrigate lawns and golf courses but is not safe for drinking.
Greywater typically includes all household sources of wastewater, with the exception of toilets. Greywater can be used to irrigate lawns and golf courses but is not safe for drinking.
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Which of the following countries is most likely to use the process of desalination as a method of obtaining drinking water?
Which of the following countries is most likely to use the process of desalination as a method of obtaining drinking water?
The United Arab Emirates is most likely to obtain drinking water by way of desalination. Seawater desalination is used primarily in arid, coastal regions.
The United Arab Emirates is most likely to obtain drinking water by way of desalination. Seawater desalination is used primarily in arid, coastal regions.
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Saltwater __________ has been described as the influx of salt water into freshwater aquifers. This is a natural process; however, human over-exploitation of aquifers has led to the contamination of drinking water in some instances.
Saltwater __________ has been described as the influx of salt water into freshwater aquifers. This is a natural process; however, human over-exploitation of aquifers has led to the contamination of drinking water in some instances.
The correct choice is "intrusion" because it is the only term that describes the movement of saltwater into freshwater aquifers. Saltwater intrusion is a major threat to many coastal land managers, because fresh groundwater can become contaminated and unusable for residents in the area.
The correct choice is "intrusion" because it is the only term that describes the movement of saltwater into freshwater aquifers. Saltwater intrusion is a major threat to many coastal land managers, because fresh groundwater can become contaminated and unusable for residents in the area.
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