Wave base is _____
a. the level of a wave trough
b. the level of a wave crest
c. found at a depth of one half the wavelength
d. found at a depth of twice the wave period
e. sea level
c
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Under natural conditions, the sex ratio at birth is ________ boys born for every 100 girls
A) 105 B) 107 C) 110 D) 120
Which statement is not true of the relationship between latitude and ocean characteristics?
a. The temperature in temperate waters is considered to be the most variable. b. Tropical waters are the only regions in which evaporation exceeds precipitation. c. Temperate waters have the largest variation in salinity. d. The polar waters have the lowest average salinity due to the melting of ice.
The oldest grain of sand found and dated is made of
A) zircon. B) diamond. C) peridotite. D) basalt.
The loess deposited in many parts of the Midwest ________
A) was once glacial outwash deposits B) is uniformly thick C) is in the form of transverse dunes D) had its source in desert regions