How Do Sand Dunes Help Maintain Sand on a Beach

question 12

Multiple Choice

How do sand dunes help maintain sand on a beach?

• A) Sand dunes stop the landward advance of the waves.
• B) People build their houses on top of them, thereby keeping the highest part of the barrier island intact.
• C) Eroding dune sand spreads over the beach and takes up wave energy.
• D) Sand dunes don't have much effect; they merely look picturesque.
• E) They don't help maintain sand on a beach.

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