Making a new soda (pop) can out of recycled aluminum requires ________% less energy than making it out of bauxite (raw aluminum ore)
A) 95 B) 80 C) 70 D) 50 E) 25
A
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The great scramble for African colonies occurred
A) just after the Napoleonic wars. B) during Portugal's domination of the world-system. C) as Spain was colonizing the America's. D) in the three decades preceding World War I. E) in the two decades after World War II.
Biomes are defined by
A) latitude. B) amount of precipitation received. C) a collection of flora and fauna. D) Altitude. E) average high and low temperatures.
Which isotope ratio is especially important in studying Earth's climate over the past 500,000 years?
a. oxygen-18 to oxygen-16 b. carbon-14 to carbon-12 c. sulfur-34 to sulfur-32 d. nitrogen-15 to nitrogen-14 e. argon-40 to argon-39
About ________ percent of the total insolation is directly absorbed by the air
A) 92 B) 62 C) 22 D) 12 E) 0.2