Final answer:
The question concerns a Las Vegas company's operations in crushing rock to make gravel, which falls under the subject of Business at the College level.
Step-by-step explanation:
The subject of the question is Business, specifically focusing on a company's operations in the materials industry. In this case, the question is about a Las Vegas company that extracts rock from a quarry and processes it into gravel. This processing involves the removal of rock, crushing it into smaller pieces, and then selling it as gravel. The description may be leading into a question regarding the cost of production, the environmental impact of quarrying, the economics of the gravel market, or other business-related aspects of running such a company.