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)
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"People must learn to hate, and if they can learn to hate, they can be taught to love, for love comes more naturally to the human heart than its opposite."
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Character motivation can affect a story's plot moving the plot forward and what's to come next in the story.
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idk because not in hih school but i can try to guess well the voyage is like a trip so like hes taking a trip
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