In which portion of a lake would oligotrophic conditions most likely occur?
A) along the shore
B) in shallow bays
C) in deep water
D) in areas where high nutrient inputs occur.
C
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There is more gold in 1 km3 of the ocean than the amount of gold mined in all of recorded history. How come we do not mine the oceans?
A) It is too dilute to separate. B) It would take too much energy. C) It would cost too much. D) all of the above E) none of the above
List the 3 major population clusterson Earth.
Why do rainbows have a curved shape?
A) The earth is circular. B) The Sun is a spherical body. C) Water molecules are circular. D) The optical process is circularly symmetrical around the path of the sunlight.
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