Question

define the following Abyssal plains

Answer 1

The abyssal plains are some of the flattest features on the planet. Some drop in elevation less than a foot for every 1,000 feet in distance. Sometimes there are small hills called abyssal hills

Answer 2

Heya my friend!
An abyssal plain is an underwater plain on the deep ocean floor. It is usually found at depths between 3,000 metres and 6,000 metres.
Hope it helps!