How do costal and interior plains differ? how are they similar?

  The Coastal plain is different from an interior plain because a coastal plain lies along the sea coast. Coastal plains also have low relief. The interior plain lies away from the coast and the elevation can vary. Coastal plains are normally damper than interior plains

Explanation:

The correct answer is "Coastal and interior plains differ in their location, where coastal plains are adjacent to the sea coast and interior plains are in the middle of territory. Coastal and interior plains are similar in that both are structurally flat and low-lying pieces of land".

Explanation:

A plain is defined as large areas of flat land with the presence of few vegetation. Coastal and interior plains differ in their location, where coastal plains are adjacent to the sea coast and interior plains are in the middle of territory. Coastal and interior plains are similar in that both are structurally flat and low-lying pieces of land, which contrasts with other landforms such as mountains and hills.