This lecture will help you understand:. Water and the hydrologic cycle Water’s distribution on Earth Freshwater ecosystems Use and alteration of freshwater systems Problems of water supply and solutions Problems of water quality and solutions How wastewater is treated.
New recreational opportunities
Disruption of flooding
Risk of failure
Lost recreational opportunitiesBenefits and drawbacks of dams
People have long diverted water to farm fields, homes, and cities
The once mighty Colorado River has been extensively dammed and diverted
Once the fourth-largest lake on Earth
It has lost more than 80% of its volume in just 45 years
The two rivers leading into the Aral Sea were diverted to irrigate cotton fields
Consequences of a shrinking sea
60,000 fishing jobs are gone
Pesticide-laden dust from the lake bed is blown into the air
The cotton cannot bring back the region’s economy
People may have begun saving the northern part of the Aral Sea
Causes more human health problems than any other type of water pollution
Fecal coliform bacteria indicate fecal contamination of water
The water can hold other pathogens, such as giardiais, typhoid, hepatitis APathogens and waterborne diseases
The picture shows a(n) … ?
c) Oxbow lake
d) River delta
The area of a lake that contains open water that does not receive sunlight is called the _______zone.
A confined aquifer is defined as…?
Arid countries tend to use their water mostly for…?
Which of the following statements is not a benefit of dams?
Pollution is defined as “the release of matter or energy into the environment that causes ______”?
Which of the following is a nonpoint source of water pollution?
Primary treatment of wastewater includes…?
What is the relationship between water consumption and the amount of land that is irrigated?
a) It is more water efficient to produce vegetables
b) It is more water efficient to produce meat
c) Vegetable and meat production are relatively alike in water consumption
d) There is little correlation between water consumption and our diet
Which conclusion can you draw from this graph?
From The Science behind the Stories
In 2001, angry farmers disobeyed a federal order to divert irrigation water downstream to save endangered species of fish. What should happen to the farmers?
Should cities in dry areas such as Las Vegas be allowed to increase their populations, so that they will require more water?