Because it is not the actual word
The author Mary Shelley use the word chimerical in that line because she said that the powers of Cornelius Agrippa were improbable and because she wanted to say this in a fancy way.
Hope this Helps :)
BTW, Mary Shelley is the author of Frankenstein <span />
The answer is b to support the authors opinion about oceans
Answer:
When you use a dictionary, you'll learn about: meaning of words
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