How Plains are Formed Coastal Plains are formed by rivers and oceans. Rivers overflow their normal banks and dry up creating plains. Coastal Plains are made up of sand, mud, and rocks. The Great Plains were formed because long ago the glaciers covered the area. As the ice receded, it produced flat lands known as The Great Plains.
CoastalPlains Coastal plains are flat, low lying land forms near the ocean. 2/3 of Alabama is made up of coastal plains which are near the gulf of Mexico. Coastal Plains are near oceans and large lakes. They are home to many natural resources such as animals and plants. Sands, dunes, and grasslands, and salt marshes make up the coastal plains.
The Great Plains The Great Plains are large areas of grass which cover a huge portion of the United States. The great plains are used for agriculture, producing 25% of the worlds wheat, oat, barley, rye, sorghum and corn. The Great Plains have two different types of grass due to rainfall. Mixed- grass in the central Great Plains and tall grass prairie in the wetter Eastern regions.