An igneous rock that shows a vesicular texture ________
A) contains many small holes, like Swiss cheese
B) must be intrusive
C) must be course grained
D) appears glassy
Answer: A
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To meet the Clean Air Act Amendments of 1990,
A) the EPA will no longer strictly enforce NAAQS standards. B) each state must develop a strategy to meet NAAQS standards for all major pollutants. C) state implementation plans apply only to sulfur and nitrogen oxide emissions. D) states with large industrial air pollutant emissions are exempt from EPA scrutiny.
Ecological systems often undergo periodic disturbances
A. only in arid environments. B. such as floods and fires. C. and show resilience when they recover quickly. D. such as floods, fires, and show resilience when they recover quickly.
How does burning of fossil fuels contribute to climate change?
Life has been sustained on the earth
A. for approximately six billion years. B. since the time of the last impact of the meteorite. C. through millions of years of ice ages and long warming periods. D. since the human species has been around. E. because of renewable resources.