Need help due in 10 mins

Why does a cake rise when you bake it? ♡

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

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?