3 Nephi 8:18

And behold, the rocks were rent in twain; yea, they were broken up upon the face of the whole earth, insomuch that they were found in broken fragments, and in seams, and in cracks, upon all the face of the land.

The rocks split in two. They broke all over the earth. Broken pieces of rock were everywhere.

Rocks split in two. They shattered across the whole earth—broken fragments, cracks, and fissures covering the land.