What would be the method of choice for dating an organic substance less than 100,000 years old?
a. uranium-238
b. potassium-40
c. rubidum-87
d. carbon-14
e. europium-123
D
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When you touch a nail stuck in ice, energy flows from
A. your hand to the ice. B. the ice to your hand. C. both of these D. none of the above
Of what value are the oceans in moderating climate change?
a. Oceans remove about 25% to 30% of the atmospheric carbon dioxide produced by humans. b. Oceans reflect sunlight back into space before the ultraviolet wavelengths are converted into infrared radiation. c. Oceans absorb about 40% of the methane out of the atmosphere that has been produced by rice paddies and livestock. d. Oceans help to reduce the level of water vapor in the atmosphere through condensation and transpiration. e. All of these answers.
Technological fixes, such as using resources more efficiently, have been able to keep up with expansion of global resource use.
Answer the following statement true (T) or false (F)
Tundra biomes occur
A. Only at high latitudes B. Almost exclusively on Antarctica C. Where rainfall is too great for tree growth D. At high latitudes, where temperatures are low E. At high latitudes and altitudes, where the growing season is short