Cory Williams was traveling through Alaska and discovered an interesting sound that he’d never heard before.  The sound was created by throwing a rock into a frozen lake.  If you stand far enough from the point of impact, the higher tones will arrive first and you hear a downward chirp.  Acoustics expert Mark Hamilton explains it as “running your finger from right to left across piano keys.”  The reason for the sound is that the lake ice acts as a vibrating plate.  The same thing occurs with metal.  You might have heard a similar sound coming from metal wires or the popular children’s toy, slinkies.

Click HERE read the full article by Becky Oskin on Live Science.