A physical feature is the mountains, deserts, and lakes. It affects where people live because of the climate, food, and water available. For example, if you live in the mountains, than you must have more snow than someone who lives in the desert. People may not want to live there because of the cold, that is why many people do not live in the mountains.
Hope this helps! :)
Basically it means when something is moving in a line and is rotating in a larger system at the same time it appears to move. If you look it up online you can easily find a picture or two that should explain it pretty well.
