The depressed portion of a waves is called as
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Explanation:
wind not only produces currents, it creates waves: as wind blows across the smooth water surface, the friction or drag between the air and the water tends to stretch the surface, resulting in wrinkles
surface tension acts on these wrinkles to restore the smooth surface -- these are waves
as waves form, the surface becomes rougher and it is easier for the wind to grip the roughened water surface and intensify the waves
highest part of the wave is called the crest; lowest part that is depressed beneath the surface is called the trough; wave height is the overall vertical change in height between the crest and the trough (= 2 x amplitude)
distance between two successive crests is the length of the wave or wavelength (L)
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