Which of the following is the name given to the radio waves produced by lightning?
A. St. Elmo's fire
B. sferics
C. thunder
D. sonic boom
Answer: B
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Most rivers have relatively gentle gradients in the headwaters and steep gradients in their downstream portions
Indicate whether the statement is true or false.
Which of the following energy sources has environmental impacts that could reduce greenhouse gases immediately, and thus have great potential for Arizona?
A) geothermal energy B) ocean-grown biofuel C) hydropower D) tidal power E) solar power
Köppen believed that the distribution of solar radiation was an excellent expression of the totality of climate
Indicate whether the statement is true or false
Which of the following does NOT refer to the transfer of electromagnetic radiation?
A) Transmission B) Reflection C) Absorption D) Scattering E) Conduction