What factors contribute to the "dead zone" in Chesapeake Bay?
What will be an ideal response?
There has been a rapid acceleration of anthropogenic fixing of atmospheric nitrogen and releasing it into the hydrosphere. This is manifested through fertilizer runoff into the waterways feeding into Chesapeake Bay. There excess nitrogen and phosphorus, combined with more nutrient loading from sewage discharge, has contributed to a rise in phytoplankton biomass. The excess biomass is partly eaten by consumers but a large amount sediments out as dead material and is metabolized by benthic decomposers. All of this increased aerobic metabolism depletes the waters of essential dissolved oxygen, leading to a hypoxic dead zone.
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Typically, water vapor occupies about what percentage of the air's volume near Earth's surface?
a. ?about 78 percent b. ?about 21 percent c. ?close to 10 percent d. ?less than 4 percent e. ?less than 1 percent
As more disorder occurs in a system, entropy
A. decreases. B. increases. C. remains the same. D. none of the above
What is New Zealand's current economic strategy?
A) It seeks to strike a balance between market-orientation and appropriate regulation. B) It is a highly-regulated economy. C) It is a socialist state. D) It is one of the most market-oriented countries in the world. E) Most industries are owned by the government.
The relationship between pH and the oxygen carrying ability of hemoglobin is known as which of the following?
A) allosterism B) the Bohr effect C) Dalton's Law D) Perutz's Law