During the past 275 years, human activities have been responsible for 70% of methane emissions. Which activity is not a source of methane?
A. raising cattle and sheep
B. the use of synthetic fertilizers
C. extracting fossil fuels
D. creating landfills
E. flooding land behind large dams
Answer: B
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The consumption of resources in the United States matchest their production.
Answer the following statement true (T) or false (F)
An abandoned field in an industrial brownfield region has been found to contain high levels of nonbiodegradable organic compounds
Recognizing the specific nature of the contaminants, plants that accumulate these chemicals are grown on the soil and then disposed of as toxic waste. This cleanup method illustrates A) bioremediation. B) phytoremediation. C) hydroponic intervention. D) remediation by incineration.
The estimated number of planets in the Milky Way is ________ with some ________ in habitable zones
A) 25 million; 3 million B) 1 million; 1 (Earth) C) 300 billion; 125 billion D) 1 billion; 25 million E) 100 billion; 500 million
Which of the following molecules can engage in hydrogen bonding?
A) HF B) HCl C) HBr D) HI