Widespread use of fossil fuels will probably result in warming Earth. This is due to
A) the large amount of heat released by fossil fuels.
B) increased acidity of the atmosphere.
C) release of CO2.
D) water vapor added to the atmosphere.
E) release of CFCs.
C
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In tropical areas of the world where refrigeration is not readily available, people store water in unglazed clay pots. This makes the water stay at a cool temperature, much cooler than the ambient temperature. How is that possible?
What will be an ideal response?
If the electrical potential in a region is constant, the electric field must be zero everywhere in that region
A) True B) False
A magnetic field will deflect
a. an alpha particle. b. a beta particle. c. a gamma ray. d. an x-ray. e. all of the above.
In the critical density universe now proposed, the ratio of dark energy to matter is about
A) 1 to 5. B) 1 to 1. C) 10 to 1. D) 3 to 1. E) 1 to 100.