Why does sound travel rapidly though the lower well-mixed surface layer?
a. Temperature and pressure are homogeneous
b. Temperature and salinity are homogeneous
c. It produces high refraction areas
d. Density is heterogeneous
ANS: B
The temperature and salinity is consistent throughout this layer. With the pressure increasing with
depth, a thin, high-velocity layer is formed above the pycnocline. Information can be found in the
section Sound Travels Much Farther Than Light through the Ocean
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