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How are barrier islands formed?

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Barrier islands are coastal landforms and a type of dune system that are exceptionally flat or lumpy areas of sand that form by wave and tidal action parallel to the mainland coast. They usually occur in chains, consisting of anything from a few islands to more than a dozen. read more

Barrier islands, sometimes called barrier spits, are found on coastlines all over the world, but are most noticeable along the eastern coast of North America, where they extend from New England down the Atlantic Coast, around the Gulf of Mexico and south to Mexico. read more

They form estuaries and lagoons that are essential for sea life. We'll look at how barrier islands form and how they continue to change over time. Lastly, we'll look at the impact barrier islands have on coastal environments. Formation. There are three main theories that explain how barrier islands form. read more

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