Multiple Choice, Multiple Answers

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Beaches are dynamic systems, constantly reshaped by waves, tides, and currents that remove sand faster than natural processes can replace it. Longshore currents, which run parallel to the shoreline, are a major driver, carrying sediment away and depositing it elsewhere along the coast. Storm surges accelerate this loss dramatically, sometimes stripping years' worth of sand in a single event. Human activity compounds the problem: seawalls and jetties, though built to protect property, often disrupt natural sand flow and starve neighboring beaches. Rising sea levels are pushing shorelines further inland, a trend expected to intensify. Coastal towns increasingly rely on artificial replenishment, trucking in sand, but this is costly and temporary, since the same forces that caused erosion soon resume their work.