Fre points

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What must occur for air masses to form fronts

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?

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.