How much of the world's water is freshwater?
a. 30%
b. 20%
c. 10%
d. 5%
e. less than 3%
E
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What is the best way to deal with pollution?
A. Pollution cleanup only B. Pollution prevention only C. A combination of pollution cleanup and prevention D. The most popular way at the current time E. The cheapest way
What keeps Earth's asthenosphere pliable?
a. Chemical composition of the asthenosphere b. The density of the asthenosphere c. Earth's internal heat d. Insulation from the lithosphere
________ is the shift to a tighter packing of sediment grains due to the weight of overburden.
A. Deposition B. Preservation C. Cementation D. Recrystallization E. Compaction
Which of the following is in proper historical sequence?
A) subsistence agriculture, commercial agriculture, hunting and gathering B) hunting and gathering, subsistence agriculture, commercial agriculture C) hunting and gathering, commercial agriculture, subsistence agriculture D) commercial agriculture, subsistence agriculture, hunting and gathering