Revision as of 08:24, 9 March 2013 by Davidy22(talk | contribs)(Created page with "Except it's not a perfect analogy because each grain is a separate entity, and it's an external force, the wind, that produces the wave motion. ~~~~")
Except it's not a perfect analogy because each grain is a separate entity, and it's an external force, the wind, that produces the wave motion. Davidy²²[talk] 08:24, 9 March 2013 (UTC)
