'Rocks' in the Bible

And behold, the curtain of the temple was torn in two from top to bottom, and the earth shook and the rocks were split.

And the kings of the earth, and the most important people, and the military leaders, and the rich, and the powerful, and every slave and free person hid themselves in the caves and among the rocks of the mountains,

And they said to the mountains and to the rocks, "Fall on us and hide us from the face of the one who is seated on the throne, and from the wrath of the Lamb,