As the echoes bounced across and died away, Susan wondered where the voice had come from.

The sound waves then travel until they hit something, at which point the echoes bounce back to the whale.

Then he heard war cries from the running men in the open, sending echoes bouncing off the rocks.

Computer researchers said the copies were like echoes bouncing back and forth off the walls of canyons.

The echoes of the thunder bounced about the peaks.

The gunfire from above had stopped, the last echoes bouncing away from them, off the mountains.

The sound, distorted by echoes bouncing off the twisting rock walls, came in odd bursts.

The echoes bounced back and forth across the street and finally were overwhelmed by a horrible, thick silence.

They blew until echoes were bouncing around the pit and from the pit to the slopes above.

A sharp report rang out, its echoes bouncing around the room like Ping-Pong balls.