Answer:
Solar power?
Explanation:
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An author of a detective novel is most likely to use figurative language to help the reader visualize a character.
These writers will use figures of speech such as similes, metaphors, personifications, etc. in order to describe their characters and make them easier to visualize for the audience. Oftentimes, these characters have very distinctive characteristics about them.
Well I would say that one of the central themes in Ernest Shackleton's South can be analyzing the complexity of the fight between the individuals and the society along with its "norms", in a world where nature is somewhat relentless towards humans. Hope this helped.