on a sandy or pebbly beach, the amount of backwash is often less than the amount of swash, why? If the swash is stronger, the backwash is weaker. The surface is permeable, so the water drains into the cracks, meaning not as much water will be washed back. On a pebble beach, larger pebbles are often found bear the top of the beach, with smaller ones nearer the bottom, why? The smaller pebbles are often found nearer the bottom of the beach because the backwash erodes the pebbles, making them smaller…
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