____________________ are manmade compounds that have been widely used as refrigerants and in spray propellants.
Fill in the blank(s) with the appropriate word(s).
CFCs
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Cultural eutrophication cannot be prevented by ____.
A. banning the use of phosphate detergents B. preventing runoff of fertilizer from agricultural fields C. advanced waste treatment D. harvesting excess weeds E. soil conservation and land-use controls
Earth's most fertile agricultural soils often come from ____ deposits
a. sand b. playa c. debris flow d. loess
Judge the following sentence according to the criteria given below: Planktonic single-celled organisms that live in colder waters have more need for extensions to help them float near the surface BECAUSE the colder seawater has a higher viscosity
than warm seawater. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
If vertical stretching causes a spinning column of air to rise and spin faster, the rapidly rotating air column may shrink into a ____
a. mesocyclone b. tornado vortex c. suction vortex d. dust devil e. downdraft