Answer:
The coastal plain is a relatively flat, low-lying area that extends from the shoreline inland. It is typically composed of sediment that has been deposited by rivers and streams over time. In North America, the coastal plain extends from the Gulf of Mexico to the Atlantic Ocean.
Step-by-step explanation:
The coastal plain is a relatively flat, low-lying area that extends from the shoreline inland. It is typically composed of sediment that has been deposited by rivers and streams over time. In North America, the coastal plain extends from the Gulf of Mexico to the Atlantic Ocean.
The Mesozoic and Cenozoic sediments accumulated along the southern and eastern edge of North American forming the coastal plain. The main reason for this is because the North American plate has been moving westward since the Mesozoic era. This westward movement caused the Atlantic Ocean to open up. As the Atlantic Ocean opened up, sediments from the east coast of North America were deposited into the ocean. Over time, these sediments were pushed against the western edge of the North American plate, forming the coastal plain.