An air mass source region should:
a. have light winds
b. have a uniform composition (land or water).
c. be generally flat.
d. All of these choices.
d
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Black lung disease results from
A. Careless strip-mining methods B. The radioactivity around coal-fired power plants C. Coal dust literally filling lungs like dust in a vacuum cleaner bag D. The radioactivity in coal E. Coal dust causing inflammation and fibrosis in lungs
The type of chain reaction in which the extra neutrons are prevented from undergoing fission to produce more U235 atoms in a nuclear reactor is a
A) self-amplifying chain reaction that is used in most U.S. nuclear power plants. B) self-amplifying chain reaction that could lead to a nuclear explosion. C) sustaining chain reaction using control rods, like that used in most U.S. nuclear power plants. D) sustaining reaction without control rods, which could lead to a meltdown.
What organism is used to treat municipal wastewater?
A. Freshwater fish B. Green algae C. Red algae D. Aerobic bacteria
This event took place approximately 13.7 billion years ago
A) Formation of the Earth B) The first volcanoes C) The big bang D) Formation of the solar system E) Formation of our Sun