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Transcript of Barrier Islands
By: Peyton Mattlin
Barrier islands are flat, lumpy areas of sand that are parallel to the coast.
They usually occur in chains consisting of a few islands.
Barrier islands can extend for 100 miles or more.
They are separated from the main land by a shallow bay, sound, or lagoon.
Found in chains separated by tidal inlets, such as the Outer Banks of NC.
How They Are Formed
The formation of barrier islands isn't completely understood.
The current theory is that they were formed about 18,000 years ago when the last Ice Age ended.
When the glaciers melted, sea levels rose causing areas behind the beach ridges to flood.
Beach- mostly sand deposited by
Dunes- formed from sand deposited and carried by winds.
Barrier Flat- formed by sediments that pushed through the dune system.
Salt Marsh- a low-lying area on the sound side of a barrier island.
Open Water- open water leading to ocean.
Beach- burrowing animals such as mole crabs and clams, shorebirds also roam.
Dunes- plants like sea oats and pancum. Ghost crab and sea gulls.
Barrier Flat- clams, mussels, snails. Cordgrass and Saw grass.
Salt Marsh- higher waters containing things like lily pads and more fish.
Waves- continually deposit and remove sand from the ocean side.
Winds- blow sediments from the beaches to form dunes.
Sea level- risin sea levels push the island closer to the mainland.
Storms- most dramatic effect. Create over wash areas and erodes beaches.