What are the three features of abyssal plains?

Abyssal plains are characterized by their flat, expansive seafloor that lies at depths of 3,000 to 6,000 meters. They are covered by a thick layer of sediment, which includes clay and silt, contributing to their smooth appearance. Additionally, abyssal plains are often located between mid-ocean ridges and continental margins, making them some of the most stable and least disturbed environments on Earth. Lastly, they are home to unique ecosystems, often supported by chemosynthetic organisms that thrive in the absence of sunlight.