A person can see well close up, but cannot do so in the distance. To correct this, lenses that are _____ having a _____ refractive power could be used
a. thicker at their center than at the edges, positive
b. thicker at their center than at the edges, negative
c. thinner at their center than at the edges, negative
d. thinner at their center than at the edges, positive
C
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Which of the following statements about Mars is not true?
A) We have landed spacecraft on its surface. B) It is considered part of our inner solar system. C) We could survive on Mars without spacesuits, as long as we brought oxygen in scuba tanks. D) It has some liquid water today, but used to have large amounts of flowing water.
Which of these is the dominant mechanism for the removal of carbon dioxide from the atmosphere?
A) subduction B) photosynthesis in plants C) dissolving carbon dioxide in seawater D) formation of carbonate-rich rocks at the seafloor
The solar neutrino experiments detect about twice as many neutrinos as theory predicts should be detected
a. True b. False Indicate whether the statement is true or false