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This major division includes the Atlantic and Gulf Coastal Plains and the Mississippi Valley Plain. The Atlantic Ocean is Earths second-largest ocean, covering approximately one_fifth of its surface. ... The Gulf Coastal Plains are a division of Texas land. ...
The Coastal Plains
This province includes the Atlantic Coastal Plain and the Gulf Coastal Plain. The "rocks" consist for the most part of layers of sand and clay which are not yet hardened into sandstone and shale. The surface is generally flat.
The Atlantic Coastal Plain is the rather flat stretch of land that borders the Atlantic Ocean (including the Gulf of Mexico).
The western border of the coastal plain is defined as the fall line, to the west of which lies the Piedmont Plateau and then the Appalachian Mountains.
The geological theory is that the plain was formed as an underwater ridge when the oceans covered the entire existing plain.
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