Why does the Environmental Protection Agency (EPA) classify CO2 as an air pollutant?
A. It has started to reach high enough levels in air to cause harm.
B. It is not a naturally occurring compound in our atmosphere.
C. It has been shown to cause cancer in rats in Canada.
D. It is a poisonous gas release from rotting plants in swamps.
Answer: A
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The balance of gravitational and buoyant forces acting on the crust determines its
A. vertical position. B. mass. C. plasticity. D. weight.
Which of the following was not an early trading post of the British East India Company?
A. Mumbai B. Chennai C. Delhi D. Kolkata
A parcel of air has a temperature of 0 degrees C as it crosses a mountain range at 3000 meters. If it descends, what will its temperature be when it reaches sea level?
15 degrees C 30 degrees C 0 degrees C 40 degrees C
The EPA's new Tox-Cast program
A) uses enhanced animal testing to screen potentially toxic chemicals. B) uses human cells such as stem cells to rapidly screen potentially toxic chemicals. C) has initiated media campaigns to alert the public to toxic chemicals. D) uses human cancer patients to screen potential allergens in the workplace.