What is used to transport water hundreds of miles from the Colorado River in Arizona to the city of San Diego on the coast of California?
A. aqueducts
B. windmills
C. floating airplanes
D. high speed trains
Answer: A
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Before the 1960s, how did geologists view the ocean basins and continents of the Earth?
Which of the following is the least abundant natural greenhouse gas?
A) oxygen B) nitrogen C) methane D) water vapor E) chlorofluorocarbons
The best description of anthropogenic activities is ________
A) human activities that reduce carbon emissions through taxing fuel used for automobiles B) human activities that increase greenhouse gases in the atmosphere C) all activities by humans affecting the Earth and its biosphere D) human activities that reduce carbon emissions through tax credits for reducing automobile emissions E) human activities that decrease greenhouse gases in the atmosphere
Where do ultramafic rocks form?
A) At convergent boundaries B) In volcanoes C) At the Earth's surface D) At the upper mantle