GEOLOGY

Detailed explanation-1: -A plain is a broad area of relatively flat land. Plains are one of the major landforms, or types of land, on Earth. They cover more than one-third of the world’s land area. Plains exist on every continent.

Detailed explanation-2: -The rivers flow down the slopes of mountains and erode them. They carry forward the eroded material. They then deposit their load consisting of stones, sand and silt along their courses and in their valleys. It is from these deposits that plains are formed.

Detailed explanation-3: -Plateaus are flat, raised areas of land made up of nearly horizontal rocks that have been uplifted by forces within Earth. They are different from plains in that their edges rise steeply from the land around them.

Detailed explanation-4: -Structural plains: These plains are mainly formed by the uplift of a part of the seafloor or continental shelf. These are located on the borders of almost all the major continents. Example: The southeastern plain of the United States was formed by the uplift of a part of the Gulf of Mexico.