Which is the largest way that we are altering the carbon cycle?
A. Burning fossil fuels to make electricity.
B. Making fertilizer out of atmospheric gases.
C. Mining ocean sediments for phosphorus.
D. Filling in natural wetlands.
Answer: A
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Why might the following nuclear reaction not be very good for energy production in a fission reactor? Fe ? Si + Mg + 3 neutrons
A) The material only produces a few neutrons so the chain reaction will not be very efficient. B) The reactants are too small to obtain energy from the missing mass due to strong nuclear force. C) The products are not the right size to obtain much energy from the missing mass due to the strong nuclear force. D) The mass of the byproducts is too high and therefore the energy released will not be high enough. E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
Which one of the following is most likely to cause eutrophication of a waterway?
A) The release of carbon monoxide from a coal-burning power plant B) The burning of diesel containing high levels of sulfur C) The eruption of a nearby volcano D) The use of detergents containing high levels of phosphorus
Drift-net fishing catches target fish, and unintentionally traps and kills large quantities of unwanted fish, called bycatch.
Answer the following statement true (T) or false (F)
Sonic booms are produced when an aircraft exceeds the speed of light at the altitude at which it is flying. The aircraft compresses the air, forming a shock wave that trails out as a cone behind the aircraft. Along the shock wave, the air pressure changes rapidly over a short distance. The rapid pressure change causes the distinct boom
a. True b. False