Factual error: The volcanic lava in this movie moves incredibly fast in the subway line. This is not only inaccurate, but also ridiculous and unnecessary. Volcanic lava can possibly move faster when in a concealed area that insulates it, but insulated lava cannot move that fast.

Volcano (1997)
Ending / spoiler
Directed by: Mick Jackson
Starring: Tommy Lee Jones, Don Cheadle, Anne Heche, Gaby Hoffmann
To divert the lava path, they collapse the newly built building. The building collapses, T. Lee Jones barely rescues his daughter and little boy from the collapse, and the lava is steered into the ocean.the new volcano is named Mt. Wilshire and is listed as A C T I V E.
Bill Bergquist
Roark: We're going to put as many people in front of it as it takes. Listen up, people! Let me tell you what's south of us: no more museums, no more department stores, just homes! People! If we turn and run now, they're going to be defenseless! You don't like my plan? That's good. Give me a another plan, but don't tell me we're backing out.
Question: Does the art museum catch fire from the lava even though they tried to stop it by putting a bus against it?
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Answer: Lava is extremely hot. It heats the air above and around it to such a degree that it can reach the flash point of various items.
Greg Dwyer