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)
Can you please explain your question better?
Answer:
Option D
Explanation:
Showing kindness towards others can improve your mood through positive social interactions and reinforcing the notion that you’re a good person is the statement best expresses the central idea of the text "Five Reasons Why Being Kind Makes You Feel Good".
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