How many alpha particles are emitted in the series of radioactive decay events from a U-238 nucleus to a Pb-206 nucleus?
A. 8
B. 16
C. 32
D. 4
Answer: A
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In natural ecosystems, what types of organisms feed off pest species and control the pest populations?
A. prey B. rodents C. pesticides D. natural enemies E. insects
There are ____ limits to population growth in nature.
A. never B. sometimes C. always D. low E. high
What best describes the way in which mass-wasting events are classified?
A. volume of material and amount of damage B. type of material and amount of damage C. tectonic setting and amount of damage D. volume of material and type of motion E. type of material and type of motion
China's Three Gorges Dam on the Yangtze and Vietnam's Nam Theun Dam on the Mekong demonstrate that
A) large hydroelectric projects can be carried out with little to no environmental impact and human displacement. B) hydroelectric installations cannot produce enough energy to compete with fossil fuel plants. C) the air pollution from the dams will have to be monitored constantly to protect human health. D) the major impacts on downstream communities will have to be carefully studied.