Since the Clean Water Act of 1972, the quantities of nitrate and phosphate entering surface waters have
A. essentially remained the same.
B. have decreased for point sources but not nonpoint sources.
C. decreased significantly for both point and nonpoint sources.
D. have decreased for nonpoint sources but not point sources.
Answer: B
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Isotopes that decay slowly are used to date
A. recent lava flows. B. ancient rock. C. prehistoric cultural sites.
Warming temperatures have accelerated the thawing of Gelisols. This is of particular concern because
A) Gelisols contain about half of the pool of global carbon and this release of carbon dioxide and methane into the atmosphere could further affect warming climate. B) as the permafrost metals, the meltwater will runoff, further contributing to global sea-level rise. C) Gelisols are an important soils for growing specialty cold weather crops. The thawing of the Gelisols will adversely impact this lucrative market. D) Gelisols are the youngest, least developed soils on the planet. Warming will further stifle the horizontal development of these soils.
In spite of the economic downturn, the United States' share of global gross domestic production rose from 23% to 31% from 2000 to 2011
Indicate whether the statement is true or false
Explain how, using no meteorological instruments other than your eyes, you could identify the passage of an occluded front.?
What will be the ideal response?