Seabed

The seabed represents the solid surface structure of the oceanic bottom, exhibiting vast morphological diversity ranging from flat abyssal plains to rugged seamounts and deep trenches. Its physical characteristics are primarily determined by geological processes, including plate tectonics, sedimentation rates, and erosional forces. The composition of the seabed varies significantly, typically comprising fine abyssal clays, calcareous ooze, or siliceous material derived from the breakdown of overlying biogenic matter. These substrates form the foundation for benthic ecosystems, providing the environment for specialized macrofauna and microbial communities adapted to high pressure and low light conditions. The sediment structure and underlying geological stability are critical determinants of the biogeochemical cycling and the associated physical dynamics of the deep ocean floor.