Question

How is costal plain formed

Answer 1

Answer:

Explanation:

Coastal plains can form in two basic ways. Some start as a continental shelf, a flat piece of land located below sea level. When the ocean level falls, the land is exposed, creating a coastal plain. ... A coastal plain can also develop when river currents carry rock, soil and other sedimentary material into the ocean.

Answer 2

Answer:

Explanation:

I only know about the

Columbus Fall Line

Coastal Plain is the youngest of Georgia's geologic provinces, making up almost half the state's surface area. The province begins at the fall line, which runs from Augusta through Macon to Columbus, and extends eastward all the way to the modern Georgia coast and southward to the Florida state line. The Coastal Plain is composed of under formed sedimentary rock layers whose ages range from the Late Cretaceous to the present Holocene sediments of the coast beneath Coastal Plain sediments are harder igneous and metamorphic rocks, such as those found in the Piedmont. Usually referred to as the "basement," these hard rocks occur at greater and greater depths toward the south and east, reaching depths of up to 10,000 feet or more beneath the modern Georgia coast. Coastal Plain rocks, then, essentially form a large, wedge-shaped mass, which is thickest along the modern coast and the Florida state line and thinnest along the "feather-edge" of the fall line. Deposits of Georgia's Coastal Plain extend with little change into South Carolina to the east and Alabama to the west.

Coastal  

High Falls

Plain sediments occur as layers, or strata, that incline gently into the subsurface toward the south in west Georgia and toward the east in eastern parts of the state. Because of this, the oldest Coastal Plain strata seen at the surface occur right at the fall line and are covered by increasingly younger layers to the south and east. These rock layers record the long history of the Coastal Plain and show that sea level has risen and fallen many times during the last 100 million years. When sea level was high, a shallow seaway covered much or even all of the Coastal Plain. During times of lower sea level, the area was dry land, with large rivers and broad floodplains. For this reason, Coastal Plain strata consist of alternating marine sediments (those deposited in the sea) and non marine sediments (those formed on land).