In the clearest ocean water, solar energy may be detected to depths of ________
A) 20 meters
B) 100 meters
C) one kilometer
D) one to two kilometers
E) two to three kilometers
C
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When agriculture involves endless hours of backbreaking work is it called
A) subsistence. B) peasant. C) labor-intensive. D) swidden. E) none of the above
What are comets made of?
a. high-magnesium and -iron rocks b. ice c. ice and some rock d. nickel-iron e. close-packed hydrogen
As opposed to a meridional pattern, the ________ pattern of upper-air flow inhibits the formation of strong cyclones:
Fill in the blank(s) with the appropriate word(s).
The Great Oxygen Event marks the time, approximately 2.3 billion years ago, when ________.
a. there was a massive volcanic eruption that lead to a very rapid increase in oxygen levels on Earth b. there was significant oxygen in the atmosphere c. there was a cataclysmic weather event that absorbed most of the oxygen in the atmosphere and locked it into iron deposits in the oceans