Sundogs form when platelike ice crystals
A) tumble while falling.
B) orient themselves vertically.
C) orient themselves horizontally.
D) melt while falling.
Answer: C
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Inadequate health care for poor women during pregnancy is one of the reasons the United States has such a high____________________
Fill in the blanks with correct word
Alluvial fan sediment is deposited by flashflood, sheetflow, mudflow, and debris flow
Indicate whether the statement is true or false
In any food web, biomagnification will result in the highest concentrations of toxins in the
A) lowest trophic level. B) highest trophic level. C) highest photosynthetic trophic level. D) herbivores of the systems.
Which of the following is a benefit of using nuclear power?
A) The increasing costs of nonrenewable energy sources make nuclear energy more economically viable. B) Core meltdown of reactors can provide "bonus" energy for electricity production. C) Few greenhouse gases are emitted. D) Using nuclear power requires greater use of fossil fuels. E) Mining activities enhance ecosystems.