<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water known as a shelf sea . Much of the shelves were exposed during glacial periods and interglacial periods . </P> <P> The shelf surrounding an island is known as an insular shelf . </P>

Shallow water zone of intertidal area on the continental shelf is called as