All feathered dinosaurs could fly
a. True
b. False
False
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Mercury is used in mercury barometers because
A) it is very heavy - lighter fluids would require a much larger glass column B) it is very heavy - lighter fluids would require a much shorter glass column C) it is very light - heavier fluids would require a much larger glass column D) it is very light - heavier fluids would require a much shorter glass column
Which is not a danger associated with volcanic ash?
A) Ash gets caught in jet engines causing them to fail. B) Ash can set fire to everything it falls on. C) Ash can cause roofs to collapse. D) Ash, if exposed to enough heat, can turn back to lava.
It has been difficult to reduce sediment pollution in streams because
A. sediment comes from point sources. B. only chemicals are easily controlled. C. sediment comes from nonpoint sources. D. very small amounts are dangerous.
Which of the following types of air masses is mainly responsible for hot, dry summer weather in southern Arizona?
A. cP B. mP C. mT D. cT