What are forms of renewable energy? check all that apply.

coal
petroleum
sunlight
wind
natural gas
heat from within the earth

answers are sunlight, heat from within the earth, wind

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?