How can algal growth be a problem in a freshwater system?
What will be an ideal response?
Algae that grow too rapidly can cover the water's surface, harming the deeper-water plants that depend on sunlight for survival. As algae die off, they provide food for decomposing bacteria. Because bacterial decomposition of organic matter requires oxygen, the increased bacterial activity drives down levels of dissolved oxygen. These levels can drop too low to support fish and shellfish, leading to dramatic changes in aquatic ecosystems and loss of biodiversity Also, the increasing turbidity and anaerobic metabolism have a destructive effect on coastal marine communities, especially coral reefs, making these eutrophic systems unappealing to fishermen and recreational users.
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When raw eggs are rapidly stirred with an egg beater, egg temperature
A. decreases. B. increases. C. remains unchanged. D. none of the above
What determines the characteristics of ocean waves?
a. The wavelength and wave period b. The wave height and wave frequency c. The wavelength and water depth d. The wave period and wave frequency
Increasing levels of greenhouse gases plays a major role in the warming of the lower atmosphere
Indicate whether the statement is true or false
In what decade did the Soviet bloc collapse and disappear?
A) 1950s B) 1960s C) 1970s D) 1990s E) 2000s