Who determined that S waves were unable to survive deep passage through the Earth's interior?
a. Alfred Wegener
b. Richard Oldham
c. Inge Lehmann
d. Francis Bacon
ANS: B
Richard Oldham reasoned that a dense fluid within the Earth absorbed the S waves. He expanded his
theory to include the prediction of shadow zones where the S waves did not occur due to that dense
liquid. Information can be found in the section The Study of Earthquakes Provides Evidence of
Layering.
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Current global-average temperatures are about ______ than they were in 1945. [INSERT FIGURE 3-32. INCLUDE CAPTION]
A) 0.1oC cooler B) 0.5oC cooler C) 0.1oC warmer D) 0.5oC warmer
________ in layered sedimentary rocks are evidence for horizontal compression and shortening.
a.) Strike-slip faults b.) Normal faults c.) Horsts and grabens d.) Tight folds
How many soil conservation districts are there across the United States today?
A. at least 100,000 B. about 100 C. more than 50 D. more than 3000
Sea-floor spreading happens at a rate of several meters per year. Indicate whether the statement is true or false