Fossil fuel use increased dramatically during the
A) demographic collapse.
B) Neolithic Period.
C) early Middle Ages.
D) Industrial Revolution.
E) Age of Exploration.
Answer: D
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Your friend says that the helium used to inflate balloons is a product of radioactive decay. Another friend says "no way." With whom do you agree?
A. Helium is an element of the periodic table, not some product of any reaction. Agree with the friend who says "no way." B. Your first friend is correct. Radioactive isotopes emit alpha particles which, in turn, capture electrons and become helium atoms. C. If helium were a product of radioactive decay, we would all be radioactive. Agree with the friend who says "no way." D. Radioactive decay produces alpha particles, not helium. Agree with the friend who says "no way."
____________ ____________ was the first to circumnavigate the world at high latitudes. What will be an ideal response?
Which of the following does not compromise the accuracy of rain gauge measurements? [INSERT FIGURE 7-25A. NO CAPTION]
A) different sizes of raindrops entering the gauge B) evaporation from the gauge C) wind blowing raindrops away from the gauge D) dust and debris falling into the gauge
Geographers Frank and Deborah Popper have proposed that in the future, much of the Great Plains should be taken out of agricultural production and instead used for what?
A) A separate homeland for Native Americans B) A huge grassland habitat for restored herds of buffalo C) To open the area up for the mining of oil from deep shale reserves D) For the development of wind farms