Ans. Ocean basin is particularly any of the several vast submarine regions which collectively cover nearly three-quarters of the Earth's surface. These basins even contain quite a variable amount of the sedimentary fill which is the thinnest on the ocean ridges and this usually is the thickest near the continental margins these are the major features of the ocean basins.Ocean basins are typically those areas that are found under the sea. This can be relatively an inactive area where the deposits of sediments are slowly collected or these are the active areas where the tectonic plates gradually meet.