When a gas is changed to a liquid phase, the gas
A. absorbs energy.
B. releases energy.
C. neither A nor B
Answer: B
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Earth is tilted at an angle of 23.5° with respect to the plane of its orbit around the Sun. If the amount of tilt were increased to 40°, we would expect in middle latitudes
a. ?hotter summers and colder winters than at present. b. ?cooler summers and milder winters than at present. c. ?hotter summers and milder winters than at present. d. ?cooler summers and colder winters than at present. e. ?no appreciable change from present conditions.
Which continent has the highest ratio of available fresh water to population size?
-Europe -Asia -North America -South America -Australia -Africa
After a uranium fuel rod reaches the end of its fuel cycle (typically 3 years), most of its energy comes from the fissioning of plutonium because
A. fissionable Pu-239 is formed as the U-238 absorbs alpha particles from the fissioning U-235. B. fissionable Pu-239 is formed as the U-235 absorbs neutrons from the fissioning U-238. C. fissionable Pu-239 is formed as the U-235 absorbs alpha particles from the fissioning U-238. D. fissionable Pu-239 is formed as the U-238 absorbs neutrons from the fissioning U-235.
Which one of the following best illustrates a situation most likely to reduce extreme poverty?
A) Farmers are encouraged to sell their land in an effort to create large farms that can be managed more efficiently. B) Children of the poorest families, both boys and girls, attend school without any cost, including school lunches. C) Banks are provided with tax incentives to help people purchase a home. D) All members of the poorest families over the age of 10 are provided with jobs on farms, helping to provide food for all the impoverished members of their community.