Waves at the shore are smallest and calmest when the tide is receding due to decreased water levels and wave activity, along with wave refraction aligning waves parallel to the coast.
When the tide is receding, the waves at the shore will be the smallest and calmest. This is because during the receding tide, the water level is decreasing, resulting in less wave activity and smaller waves. Wave refraction also plays a role in making waves smaller and calmer near the shore by causing them to align parallel to the coast.
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