Echolocation Movie

 Here is a movie of Echolocation 

Facts about Sound

Sound comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears.

http://www.sciencekids.co.nz/sciencefacts/sound.html

Large vibrations make a loud sound, and small vibrations make a quieter sound.

http://www.prisci.gold.ac.uk/hearingwhispers/facts.htm