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)
<h3>Judith Sargent Murray would have disagreed to Benjamin Franklin's view on the role of women. She would have responded to Franklin by saying that women is so much more than their ability to carry a child.</h3>