What triggered the Huronian glaciation at 2.3 b.y. ago?
What will be an ideal response?
The most likely trigger for the Huronian glaciation was the decrease in CH4 that resulted from the rise of O2. The increased O2 concentrations would have eliminated much of the CH4 present in the atmosphere, thereby reducing the greenhouse effect.
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What kind of heat pump uses the constant temperature of the earth as a source of heat in winter and as a store for heat in the summer?
A. geothermal B. solar C. wind D. hydropower E. biofuel
Surface Weather Map
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Refer to the above surface weather map.
At which of the following positions is heavy snow most likely falling?
A. 1 B. 2 C. 3 D. 4
cJudge the following sentence according to the criteria given below: Ancient volcanic calderas are a
particularly rich source of important metallic ores like copper, nickel, zinc, lead, and silver BECAUSE these dense heavy metals get left behind when the caldera explodes. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect.
The concentration of ____________________ is close to 21 percent (by volume) in the upper stratosphere (the same concentration as in the trophosphere), but without proper breathing apparatus you would not be able to survive there
Fill in the blank with correct word.