Final answer:
Tides are the periodic rise and fall of sea levels influenced by gravitational forces from the moon and sun.
Explanation:
Tides refer to the rise and fall of sea levels caused by the gravitational pull of the moon and sun combined with the Earth's rotation. Tides can vary in frequency and amplitude, leading to different types like diurnal, semi-diurnal, and mixed tides. Coastal erosion and deposition are influenced by tidal action as shorelines shift.
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