Explain how coastal dune fields need not originate in desert climates. What will be an ideal response?
All you need for dunes to form is an abundance of sand, a lack of stabilizing vegetation, and wind. In
non-desert coastal dune fields, the sand supply simply overwhelms the vegetation.
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Carbon dioxide warms the troposphere, enhancing the planet's natural
A. greenhouse effect B. tipping point C. biogeochemical cycle D. carbon cycle E. net primary production
To meet the Clean Air Act Amendments of 1990,
A) the EPA will no longer strictly enforce NAAQS standards. B) each state must develop a strategy to meet NAAQS standards for all major pollutants. C) state implementation plans apply only to sulfur and nitrogen oxide emissions. D) states with large industrial air pollutant emissions are exempt from EPA scrutiny.
The moist subtropical climate experiences abundant rainfall with a winter maximum.
a. true b. false
Ultramafic igneous rocks (those with very high magnesium and iron, and low silica content) may offer the best hope for improving the environment by
A. being placed on the ocean floor, where they can absorb water and reduce global sea levels. B. absorbing CO2, with their rate of absorption capable of being increased by people. C. reducing the rate of salinization of soils when it is ground into a fine powder and sprinkled on the surface. D. pulling ground-level ozone out of the atmosphere as it cools.