97% of Earth’s hydrosphere is made of fresh water.
Indicate whether the statement is true or false.
Ans: False
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One of the driving forces of atmospheric circulation is ____
A) Earth's uneven solar heating B) alternating high and low pressures C) evaporation and condensation D) the Coriolis effect
The "baby boom echo," represented by people who are 24 to 33 years old in 2014, is the result of
A) increased fertility of the baby boom generation. B) reduced infant mortality rates. C) reproduction of the baby boom generation. D) increased use of birth control in the 1970s.
Like Jupiter and Saturn, Neptune emits about 2.5 times as much heat energy as it receives from the Sun, although calculations show it should have already lost all of its original heat. What is the most likely explanation?
A. Radioactive decay has kicked into overdrive, with runaway reactions taking place. B. There are also unexplained gravitational effects taking place, which may hold some clue as to where the heat may be coming from. C. Uranus' gravity is creating a "slingshot" effect, catapulting solar winds into Neptune's atmosphere in the form of as of yet undetected radiation. D. The basis for these calculations is currently being questioned by a new breed of more probing scientists. E. Unlike Uranus, it is still contracting.
What is the rank these food production systems in order of proportion of the world's food supplied from biggest to smallest?
A. cropland, rangeland, and fisheries B. rangeland, cropland, and fisheries C. fisheries, rangeland, and cropland D. cropland, fisheries, and rangeland E. rangeland, fisheries, and cropland