Question

correct the text by inserting one comma.
when an earthquake jolted pakistan in 2013 the force caused ocean mud to rise to the surface, creating a small island in the middle of the arabian sea.

Explanation:

A comma is needed after an introductory dependent clause. "When an earthquake jolted Pakistan in 2013" is an introductory dependent clause, so a comma should separate it from the independent - clause that follows.

Answer:

When an earthquake jolted Pakistan in 2013, the force caused ocean mud to rise to the surface, creating a small island in the middle of the Arabian Sea.