The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
A) more than 10 N.
B) less than 10 N.
C) 10 N.
C
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Acid mine drainage occurs when ____.
A. mines use acid to clean equipment B. acid is used to remove rare earth minerals from mines C. acid is used to detect low grade mineral ores D. naturally occurring acids are uncovered during the mining process E. rainwater seeps through an underground mine spoils pile and produces sulfuric acid
Some species that tend to reproduce later in life and have a small number of offspring with long life spans ____.
A. have high population growth rates B. have high environmental resistance C. have low environmental resistance D. are unlikely to ever face extinction E. are vulnerable to extinction
Which of the following is a key part of the formation of most natural bridges?
A. folding of soft rock layers B. stream erosion C. spheroidal weathering D. volcanic eruptions E. None of these choices are correct.
Why are fossils of carnivores less common than fossils of other animals?
a. They don’t live in areas where fossilization is likely to happen. b. They are better able to escape sudden catastrophic events. c. Their large family units have a well-developed warning system.
d. They are warm-blooded and decay faster. e. They make up a small percentage of the animal population.