FLASH CARDS
Ocean Motion
wave
movement of energy though a body of
water
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trough
lowest point of a wave
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wave height
vertical distance between the crest and
trough of a wave
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spring tide
greatest difference in the heights of high
and low tides
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longshore drift
movement of sand along a beach
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rip current
a rush of water that flows rapidly back to
sea through a narrow opening
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erosion
to break up rock and carry it away
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crest
highest point of a wave
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tides
daily rise and fall of water on Earth’s
coastlines
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neap tide
least difference in the heights of high and
low tides
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winds
mostly causes ocean waves
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wavelength
horizontal distance between wave crests
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tidal power
a clean, renewable source of energy that
uses water movement between high and
low tides to produce electricity
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groin
a wall of rocks or concrete that reduces
erosion along a stretch of beach
(however, it increases the amount of
erosion farther down the beach)
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gravity
the force from the sun and moon that
causes tides
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