Shane, who lives in perth, australia, has never seen a white christmas. in fact, december is one of the hottest months in australia. why is it that australia has such warm weather at this time of year?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?