I asked a geologist if rocks are alive.

This joke hinges entirely on a clever bit of wordplay, specifically a pun. The humor comes from the punchline "He said ofite not," which sounds almost identical to "Oh, it's not." This creates a chuckle because it directly answers the question about rocks being alive in a negative way, while simultaneously introducing a geological term. It's a classic example of a pun that uses a homophone (or near-homophone) to deliver a double meaning.

The real-world context here involves both geology and a common understanding of the natural world. Geologists are, of course, experts in rocks, and generally, rocks are considered inanimate objects – they don't breathe, grow, or reproduce in the way living organisms do. The term "ophite" itself refers to a specific texture found in igneous rocks, characterized by lath-shaped plagioclase crystals enclosed in augite. So, the joke cleverly takes a scientific term that might be familiar to a geologist and twists it into a humorous, unexpected answer.

Ultimately, the joke delights in its linguistic dexterity, blending a straightforward question with a geologically-infused denial. It’s a perfect little nugget for those who appreciate a good groan-worthy pun, especially when it comes with a side of scientific flair.