Mammoth Cave: Grand and Gloomy

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gloomy - adj. somewhat dark

peculiar - adj. not usual or normal

mammoth - adj. very large

vast - adj. very great in size, amount, or extent

seep - v. to flow or pass slowly through small openings in something

primitive - adj. to flow or pass slowly through small openings in something

venture - v. to go somewhere that is unknown, dangerous, etc.