To create a better image in the reader's mind. The use of imagery creates a better picture when the reader imagines the setting. Since when reading everyone thinks of a different picture imagery helps to create a picture closer to what the author imagined.
Answer:
Polarization is the process that causes neutral parties to take sides in a conflict. It also causes individuals on either side of the conflict to take increasingly extreme positions that are more and more opposed to each other.
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You should use the definition or explanation clues in understanding the meaning of the word or phrases that are unfamiliar. This kind of context clue lets you explain about or give the explanation of the word or phrases right after it is used.