Answer 1

Abyssal Plains:

1. Beyond the continental slope, lie the abyssal plains. They have a gentle slope and cover about 66 percent of the oceanic floor area.
2. Abyssal plains of the ocean have deposits of polymetallic nodules. These nodules are a source of nickel, copper, manganese, and cobalt.
3. India has been allotted an area of 2 million square kilometers for research and excavation of polymetallic nodules by the International Seabed Authority in the Indian Ocean.