Ans: Primary coasts are more land-driven rather than ocean-driven like land erosion, plane tectonic, and sedimentation. It includes land deposition coasts where the river flows into the ocean and sediments gather along a wide shelf. For example, volcanic coasts like Hawaiian Island hot spots, Nile river delta are primary coasts.On other hand, secondary coasts are more ocean-driven rather than land-driven like land erosion, plane tectonic, and sedimentation. It includes marine deposition coasts where the river flows where sea movements cause accumulation of ocean sediments in one single place. For example, mudflats, barrier lands, and coral reef ecosystems.