21. describe each of the four mechanisms that cause air to rise.(4 points)

1. Convective uplift. The hot air is less dense and it rises.
2. Orographic lifting. Air is forced to rise when it meets a mountain.
3. Convergence. Thunderstorms are caused by convergence.
4. Frontal wedging. When a cold air mass meets a warm air mass, the colder air wedges its way beneath the less dense warm air.
Mind marking this as Brainliest??

Answer metamorphic rock;