Toxic metals such as lead, cadmium, and mercury
A. Usually don't accumulate in food chains
B. Can be toxic if high concentrations are reached
C. Are the most common health threat in water
D. Can be toxic in extremely small quantities
E. Rarely threaten water supplies
Answer: D
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A tectonically quiet zone results when
A) crust materials are soft. B) the lithosphere is not too dense. C) there are many small faults. D) plates move in the same direction at the same velocity.
What has been the consequence of China's "one-child" policy?
A) The average total fertility rate has declined to 1.6. B) The number of baby boys far exceeds the number of baby girls. C) Gender-selective abortion has emerged. D) Some families have abandoned healthy baby girls at birth. E) All answer choices are correct.
Running water is an important erosional agent in many arid lands despite infrequent rainfalls
Indicate whether the statement is true or false
The Kyoto Protocol:
A. called for stabilization of greenhouse gases at levels that would not harm the climate system. B. did the actual research and reviews of thousands of published scientific papers and reports. C. set up arrangements for sharing data on climate, developing national plans for controlling greenhouse gas emissions, and for adapting to climate change. D. ended in a 60-hour negotiation session in which all the developed and developing countries, including China and the United States, agreed to legally binding restrictions on greenhouse gas emissions.