A change in direction of a body wave when it crosses a boundary between layers with different physical properties is called seismic
A) absorption.
B) reflection.
C) refraction.
D) velocity.
Answer: C
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According to biologist Quentin Atkinson, the world's languages originated in
A) North America. B) South America. C) Europe. D) Asia. E) Africa.
Under certain circumstances, natural selection can lead to an entirely new species, a process called ____.
A. genetic drift B. genetic isolation C. diversification D. speciation E. mutation
Hinduism's caste system
A) assigns everyone to a distinct class. B) decrees the pilgrimages which should be taken. C) is a substitute for the lack of a holy book. D) identifies a family's important deities. E) is the basis for seasonal celebrations.
The last glacial advance peaked in North America about ____ years ago
a. 150 b. 3,000 c. 18,000 d. 100,000 e. 2.6 million