Other mistake: When they are trying to find a way to stop the lava from going in to the museum, Tommy Lee Jones has an idea to push a bus up against the museum to divert the lava. The plan works but the lava does not melt the bus like it melted Tommy Lee Jones' car or the fire truck.

Volcano (1997)
61 mistakes - chronological order
Directed by: Mick Jackson
Starring: Tommy Lee Jones, Don Cheadle, Anne Heche, Gaby Hoffmann
Kelly Roark: Please, please. You can't just leave me here.
Roark: Kelly, you can not be here and I have to.
Kelly Roark: Why?
Roark: Because it's my responsibility.
Kelly Roark: Well, so am I. Please I promise I won't get in the way.
Trivia: The lava was primarily made of methylcellulose, the thickening agent used in fast-food milkshakes, and the ash was made mostly of ground newspaper.
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