What is the approximate mixing time of the ocean?
A) 160 years
B) 1,600 years
C) 16,000 years
D) None of these choices
B
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Galaxies are aggregations of stars, stellar dust, and gas. Their masses
A. are small compared to blue supergiant stars. B. depend on the rate of pulsar emissions within them. C. vary greatly from one galaxy to the next. D. are all about the same, which is huge.
Which of the following describes the path of light into the eye in the correct order?
A) cornea ? lens ? pupil ? retina B) cornea ? pupil ? lens ? retina C) pupil ? retina ? iris ? cornea D) iris ? cornea ? pupil ? retina
Which of the following increases as temperature increases?
A) kinetic energy B) nuclear forces C) potential energy D) none of these
Truck carriers have low terminal costs largely because
A) the price of gasoline fluctuates frequently. B) relative to other carriers they are less flexible. C) they do not have to pay for provision and maintenance of roads. D) they cannot compete in the global commodity traffic. E) none of the above