Barrier islands are separated from shore by a lagoon or a sound. They are referred to as barrier islands as a result of they act as limitations between the ocean and the mainland. They shield the coast from being directly battered by storm waves and winds.
Still different barrier islands had been fashioned of supplies deposited by Ice Age glaciers. When glaciers melted, they left piles of the rock, soil, and gravel they had carved out of the panorama. As flooding occurred alongside coasts after the glaciers melted, these moraines had been surrounded by water. Long Island, New York, and Nantucket, Massachusetts, are both barrier islands fashioned by glacial moraines.
Barrier islands are slim and lie parallel to coastlines. Some are part of the continental shelf (continental islands) and manufactured from sediment—sand, silt, and gravel. Barrier islands can be coral islands, produced from billions of tiny coral exoskeletons.
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