The main cause of urban air pollution in China is
A. automobile traffic
B. bicycles
C. use of coal as a fuel
D. trash
C. use of coal as a fuel
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Determine if the phrase in bold applies to only contact metamorphism, only regional metamorphism, both types of metamorphism or niether type of metamorphism. May underlie several adjacent states
- Both contact and regional metamorphism
- Only contact metamorphism
- Only regional metamorphism
- Neither contact or regional metamorphism
Records indicating rapidly rising temperature of about 1°C since the the 1950s provides evidence for ________.
A. volcanic activity B. human-induced climate change C. natural variability of Earth's climate D. uncertainties and errors in the data
Scientific results and hypotheses that are presented as reliable without having undergone peer review, or are discarded as a result of peer review or additional research, are considered to be ____.
A. theories B. unreliable science C. models D. scientific laws E. projections
The United States generates its energy from several sources. What is the most important energy resource, which accounts for over 40% of the energy generated in the U.S.?
A) coal B) natural gas C) nuclear power D) petroleum (oil) E) wood