What color would the sky be if air molecules selectively scattered only the longest wavelengths of visible light?
a. white
b. blue
c. red
d. black
e. violet
ANSWER: c
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Why might the Pacific Ring of Fire be more appropriately called the "Horse Shoe of Fire"? What will be an ideal response?
The only indication on the station model of past weather conditions is the
a. ?temperature. b. ?dew point. c. ?cloud cover. d. ?wind direction. e. ?pressure tendency.
Most tsunami travel at speeds of ________ miles per hour.
A. 42,000 to 48,000 B. 420 to 480 C. 4,200 to 4,800 D. 4.2 to 4.8 E. 42 to 48
The change from thinking the continents are stationary to understanding that the outer layer of the earth moves slowly nearly all of the time occurred primarily because ________
A) we began to make global observations that required recognition that the continents and oceans had not always been in their current positions B) we had two world wars and learned a lot from them about the oceans that explained how continents moved C) we improved our surveying instruments significantly D) we got space travel and could see the motions