He wouldn't be able to make a snowball explode as it's snow/ice which = organic. However he could like put something inside the snowball and make it pop that way.<br/><br/>And the reason Gambit can only charge inorganic matter is because Mr. Sinister(by request from Remy) removed the portion of his brain that let him use his full power. With it he could control kinetic energy on an insane scale and was essentially a God named "New Son".