Identical waves superimposed in phase produce a wave of increased
A. frequency.
B. amplitude.
C. wavelength.
D. all of the above
Answer: B
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Hurricane Katrina lost most of its power when
A) sea surface temperatures underneath it increased. B) it was still a tropical depression. C) it made landfall in the United States. D) its eye was most fully developed. E) its spiral rainbands were most prominent.
Pastoral nomadism is the predominate system of agriculture practiced in which of the following regions?
A) Subsaharan Africa B) Latin America C) Australia D) Northern Africa E) Europe
What is the dominant market sector in the U.S. and Canadian economies?
a. energy b. industrial c. manufacturing d. service e. knowledge
Heat within the earth moves slowly up toward the surface. What is the primary mechanism of heat transfer?
What will be an ideal response?