North Carolina’s Outer Banks

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Presentation transcript:

North Carolina’s Outer Banks Barrier Islands North Carolina’s Outer Banks

What Are Barrier Islands? Long bodies of unconsolidated sand, separated from the mainland

North Carolina’s Outer Banks 90% of NC’s shoreline is made of barrier islands There are 18 North Carolina barrier islands

Main Components of a Barrier Island The Island, Inlets, Tidal Deltas

The Island Made up entirely of sand carried either from the ocean or from the lagoon beach by wind action and storm overwash

Inlets Channels that separate adjacent islands and allow the exchange of water between the ocean and lagoon Inlets can open, close or migrate in a matter of years.

Tidal Deltas Formed from sand deposited by the tidal currents Tidal currents move the sand to form the deltas

Formation of Barrier Islands Barrier islands are the product of sea level rise Step 1- During Ice Age, sea levels were low due to so much water frozen in glaciers. Step 2- As ice melts, sea level rises & river valleys are flooded. Step 3- Formation of spit along headlands. Step 4- Separation of barrier from mainland.