The correct option is 1, 2, 3 and 4.
Explanation
The Continental Margin is the zone of transition between the continental crust and the oceanic crust (deep-sea floor). In oceanography and geomorphology, it is defined as the submerged outer edge of the continent.
Statement-wise Analysis:
- Statement 1 is Correct: The Continental Shelf is the gently sloping seaward extension of the continental plate. It is the shallowest part of the ocean and is geologically part of the continent.
- Statement 2 is Correct: The Continental Slope connects the continental shelf to the deep ocean floor. It is characterized by a steep gradient and marks the boundary between the continental crust and the oceanic crust.
- Statement 3 is Correct: The Continental Rise is a major depositional regime located at the base of the continental slope. It consists of thick sediments accumulated from the continent.
- Statement 4 is Correct: Deep-oceanic Trenches are steep depressions in the deepest parts of the ocean. Trenches are considered part of the continental margin, specifically in active margins (convergent boundaries) where subduction occurs.
Key Takeaway:
The Continental Margin includes the shelf, slope, rise, and deep-oceanic trenches. It ends where the abyssal plain (deep-sea plain) begins.