ANSWER:
Through Earth’s history the rock strata have "piled up" and become "highly folded" along mid-ocean ridges is true.
EXPLANATION:
Through the earth's history, Rock strata is a layer formed due to sedimentary soil at the surface of Earth. This occurs because of various natural process which takes place through the soil.
These piling up of the rock strata results in extending over thousands of square kilometers of the earth's surface, thus becoming highly pleated along the mid-ocean ridges.