They change shape due to a number of reasons.
The easiest reason to understand why they change is that they erode.
The coasts around the the world erode due to waves hitting cliffs, the wind batting against the coasts etc. Over a long period of time we can see that they change in shape.
(sorry I don't know why they move)
during the time before the renaissance, the church was the centerpiece to everyone's life. therefore, <u>true</u>
Personification gives human-like characteristics to non-human things. The air doesn't have lungs therefore it can't "breathe". The personification here is simply that the air is being described as breathing.