If the Earth was in a warming trend, which of the following processes would most likely act as a negative feedback mechanism?
A. decreasing the amount of cloud cover around the Earth
B. increasing the carbon dioxide content of the air
C. increasing the snow cover around the Earth
D. increasing the water vapour content of the air
Answer: C
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Coal contains only minute quantities of radioactive materials, yet there is more environmental radiation surrounding a coal-fired power plant than a fission power plant. This indicates that
A. the coal-fired power plant has been contaminated. B. the news media is biased in its coverage. C. the coal-fired power plant contains none of the radiation it releases. D. the coal-fired power plant's radiation shields need to be strengthened.
Today, what percentage of Aboriginals live in urban areas?
A) 25% B) 90% C) 10% D) 70% E) 35%
Polar climates get most of their precipitation in the ________
A) summer B) spring C) winter D) fall E) It is uniform throughout the year.
What two factors largely determine the diversity of species on an island?
A) migration and replication B) immigration and replication C) viability and extinction D) migration and extinction E) replication and extinction