Sea levels have risen recently, and will probably rise further in the future, due to
A) ozone depletion caused by increased CFCs and other ozone-destroying chemicals.
B) global warming caused by increased CFCs and other ozone-destroying chemicals.
C) ozone depletion caused by increased CO2 and other greenhouse gases.
D) acid rain caused by compounds of sulfur and nitrogen in coal.
E) global warming caused by increased CO2 and other greenhouse gases.
E
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New stars are most likely to form in
a. the central bulge of the galaxy, where star density is higher. b. small, individual clouds of cold, dense gas and dust collapsing to form single stars or binaries. c. regions of ionized hydrogen near young, massive O and B stars (H II regions). d. immense clouds of cold, dense gas and dust up to 300 light-years across.
Which of the following statements is true of giant stars?
A) Supergiant stars are 1000 times smaller than the Sun's diameter. B) They have more surface area than main-sequence stars of the same temperature. C) They have very low luminosities because of their big size. D) Red dwarfs are giant stars that are hot and have high luminosities.
No stars have been found with masses greater than 300 times our Sun because
A) molecular clouds do not have enough material to form such massive stars. B) they would fragment into binary stars because of their rapid rotation. C) they would generate so much power that they would blow themselves apart. D) they shine exclusively at X-ray wavelengths and become difficult to detect. E) they are not bright enough to be seen nearby.
Shortly after the Big Bang, the chemical composition of the universe was
A) almost entirely hydrogen and helium. B) hydrogen only. C) about equal amounts of all the elements. D) about the same as it is today.