Dante's Peak (1997)

Factual error: After the volcanic eruption, there's a scene where we see our heroes going across a lake, which has been turned to acid by the lava. If this acid is strong enough to corrode the propeller, then surely the fumes would be destroying their lungs, in which case they should be dead, or close to it.

Davidian

Harry Dalton: I've always been better at feeling out volcanoes than people and politics.

Trivia: When we see Paul in the van as it is taken over by the overflowing river, just as he hits the water, we hear the Wilhelm scream.

Question: I'm asking this because I don't really know a lot about volcanoes but, at the beginning of the movie, Harry was in the middle of a volcano eruption with: rain; rocks falling etc. When the volcano in Dante's Peak erupted, it was different from before, meaning that there was no rain (but ash), rivers strong enough to break a dam, burning water, dead wildlife etc. Even at the end of the movie, the volcano still had one more eruption before it finally died down. My question is, are all volcano eruptions not the same or are they just unpredictable when they explode? It just seems kind of odd that Harry was experiencing different things in nature after the volcano exploded. I hope I explained this enough; I'm just curious is all.