Question

ocean water contains vast quantities of minerals . but their extraction is not always economically beneficial. what was the main difficulty to extract minerals from the ocean

Answer 1

the minerals present in the ocean water are present in extremely small quantities show the extraction is not easy as they have to be separated from a large number of solvents.

Answer 2

The minerals in the ocean are present in very small quantities so it is not very economically beneficial....

It is present in solvents and requires to be removed from it which is difficult