When you speak, exactly what moves across the room at 340 m/s?
A. The air.
B. Empty spaces in the air.
C. Wave motion through the air.
D. Molecules in the air.
Answer: C
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What determines the availability of energy in a tropical cyclone?
A) Evaporation rates B) The storm needs to stay over warm waters C) Condensation D) Latent heat of vaporization
Why is the probability of dying from a meteorite impact greater than that of dying in an automobile accident?
A) because fatal meteorite impacts are likely to occur very frequently B) because there is a high probability that any person will be hit directly by a meteorite C) because a large meteorite impact would cause a very high number of fatalities D) because there are millions of meteoroids in near-Earth orbit
Europeans generate more CO2 emissions than do Americans
Indicate whether the statement is true or false
Which of the following are pioneer species?
A. Wood warblers B. Lichens C. Starlings D. Humans E. Dandelions