Scientists think that water may once have flowed on Mars. The evidence for this is
A. channels that resemble dried-up riverbeds
B. fossil fish found in several craters
C. photographs made in the late 1800s that show blue spots that were probably lakes
D. frozen lakes along the Martian equator
Answer: A
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Around the world, runoff from heavy use of synthetic fertilizers has created
A) coastal dead zones. B) new deltas of arable lands. C) super fisheries. D) biochemical farming zones. E) harvestable deposits of reusable fertilizers.
An aqueous solution is a mixture of
A. nonpolar molecules dissolved in a polar solvent B. water dispersed in an ionic compound C. some compound dissolved in water D. polar molecules dissolved in a nonpolar solvent E. none of the above
At Barrow, Alaska (latitude 70°N), you would expect the prevailing wind to be ____
A) northerly B) easterly C) southerly D) westerly
Which one of the following does not represent indirect solar energy?
A) Nuclear fission B) Biomass C) Hydroelectric D) Windmills