How does the Black Sea seafloor change from the continental shelf to the deep basin?

The seafloor of the Black Sea transitions from a shallow continental shelf to a deep, featureless basin through a distinct slope.1

• Continental Shelf: This zone occupies approximately one-fourth of the sea's total area. It is widest in the west and near the Kerch Strait, while elsewhere it forms a rim roughly 6 to 7 miles (10 to 11 km) wide. The edge of this shelf typically lies at depths of less than 360 feet (110 metres).1
• Slope: Beyond the shelf edge, the seafloor drops into a slope that is notably steep in its upper sections and is frequently broken by submarine valleys.1
• Deep Basin: The core of the basin covers about one-third of the sea's total area. It is a flat, featureless plain where depths increase steadily toward the center, reaching a maximum of more than 7,200 feet (2,200 metres).1
• Sedimentation: Geologically, the seafloor deposits show a clear transition, moving from coarse pebbles and gravel at the periphery to fine silts toward the center of the basin.2