Exam 15: Freshwater Systems and Resources

Define water pollution,point source,and non -point source pollution.Which of the two (point source or non -point source)is easier to identify? Which is easier to legislate? Which currently poses the greater threat to fresh water?

One -fifth of Earth's total freshwater supply is in _________________ .

Describe the benefits obtained by the creation of artificial wetlands.

Only about 2.5% of all the water on our planet is fresh water,and _________________.

Recent research that analyzed the content of commercial bottled water indicates that _________________.

Use the Three Gorges Dam on China's Yangtze River to illustrate the benefits and costs associated with building dams.

A septic system is _________________

Emergent vegetation such as cattails and reeds grow in the _________________ zone of a lake.

The fish in the lake at the local park are dying,and a professor from the local college comes to investigate.First she measures the levels of dissolved oxygen because she wants to check for _________________

What is the main argument against removing O'Shaughnessy Dam in Yosemite National Park?

Dam removal in the U.S._________________

Levees are used _________________

Discuss the environmental,quality,and economic issues associated with the manufacture and consumption of bottled water.

A 2009 study found that one -third of the world's 925 major rivers experienced reduced flow from 1948 to 2004,with the majority of the reduction attributed to _________________.

It is estimated that by 2035,half of the people in the world will live under severe water shortages.Discuss three specific strategies for conserving water.

How can algal growth be a problem in a freshwater system?

Why is grain production in the Great Plains considered largely unsustainable?