As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. Match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

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?