The coastal part of water bodies of the oceans which is structurally part of the mainland of the continents is called – (1) Isthumus (2) oceanic ridge (3) continental shelf (4) continental slope
(3) continental shelf Explanation: The continental shelf is the extended perimeter of each continent and associated coastal plain. The shelf usually ends at a point of increasing slope (called the shelf break). The sea floor below the break is the continental slope.