Which equal volume of material expands more when the temperature is lowered?
A. Water at 4°C.
B. Helium.
C. Iron.
D. Wood.
Answer: A
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How does excess CO2 in the atmosphere cause more extreme flooding?
A. It warms the atmosphere and causes increased evaporation. B. It cools the atmosphere and causes decreased evaporation. C. It combines with rain droplets and makes them larger. D. It increases the acidity of the rain and while the amount of rain is the same, the acidity causes more erosion.
Which of the following molecules is most likely to show a dipole-dipole interaction?
A. CH4
B. H-C 
C-H
C. CO2
D. H2S
E. none of the above
When an ENSO event occurs, warm equatorial waters flow ____ in the equatorial Pacific
A) ?east B) ?west C) ?north D) ?south
________ are federal lands that are off-limits to development but are open to hiking, nature study, and other low-impact public recreational activities
A) BLM lands B) Biosphere reserves C) Wilderness areas D) State parks E) National forests