Why does most chemical weathering only happen on the outer surface rock? explain.

What provides structure to the human body?

How will the emission of an alpha particle affect the atomic number of an atom

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?