What will most likely be the best source of new energy resources in the future?
A) hydroelectric
B) oil
C) solar
D) conservation
Answer: D
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A sample of water that is 99.9999 percent pure contains 0.0001 percent impurities. Consider from Chapter 1 that a glass of water contains on the order of a trillion trillion (1 × 1024 ) molecules
If 0.0001 percent of these molecules were the molecules of some impurity, about how many impurity molecules would this be? A) 1000 (one thousand: 1 × 103) B) 1,000,000 (one million: 1 × 106) C) 1,000,000,000 (one billion: 1 × 109) D) 1,000,000,000,000,000,000 (one million trillion: 1 × 1018)
After four half-lives, 1/8 of the radioactive parent isotope atoms will remain. Indicate whether the statement is true or false
Approximately what percentage of the earth's land surface is desert and steppe?
A) 20 percent B) 50 percent C) 40 percent D) 30 percent
Deep ocean trenches are associated with ________
A) rift valleys B) subduction zones C) submarine canyons D) transform faults E) turbidity currents