________ is also added to the atmosphere by the combustion of fossil fuels
A) Nitrate
B) Argon
C) Chroflourocarbon
D) Carbon dioxide
E) None of these answer choices are correct.
Answer: D
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Geochemical studies of rocks show that earth is approximately ________ years old
A) 500 million B) 6 thousand C) 30 billion D) 4.56 billion
The safe movement of hazardous materials by rail or highway in the United States is regulated by
A) individual states and cities. B) the Department of Transportation. C) the regulations of the RCRA. D) the Justice Department.
A variety of the cotton modified to resist pests without the use pesticides is
A. Bt cotton. B. Pl cotton. C. Pt cotton. D. Bl cotton.
What is a geothermal gradient? Given an average geothermal gradient for continents and a surface temperature of 15°C, what is the temperature at a depth of 10 kilometers?
What will be an ideal response?