A cap-and-trade program exists for which pollutant?
A. SO2.
B. CFCs
C. CO2
D. formaldehyde
E. lead
Answer: A
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A crate is at rest on a horizontal floor. The friction force acting on the crate is
A. between zero and the weight of the crate. B. equal to the weight of the crate. C. zero. D. none of the above
The Milky Way galaxy contains > 300 billion of stats, and the whole Universe contains > 100 billion of galaxies.
a. true b. false
Most stream valleys have a V shaped cross section because ________
A) mass wasting of weathered rocks on the slope maintain an angle of repose slope. B) vegetation on the slopes forces this profile. C) water washing down the slope makes straight channels. D) none of the above
Why is the early rock record of the Precambrian rocks more difficult to interpret than the rock
record of the Phanerozoic Eon? What will be an ideal response?