Put in the prepositions: up and down, under, across, behind, off, from, at. A terrible noise was coming ... the ground.

A terrible noise was coming from the ground. The earth was moving up and down like a sea. The ground was moving under his feet.He ran and heard screams from behind him. When he saw that a mountain seemed to fly at him, he swam across the river. Later he realized that the earthquake broke off a large piece of the mountain.