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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)
Identify the 4 elements of rhetoric. Start your analysis by taking note of the following rhetorical elements:
Describe the rhetorical appeals.
Analyze.
Evaluate.
State your thesis.
Organize your ideas and evidence.
a suffix can change the meaning of the root word