After dashing off to Grandma’s house to rescue his girlfriend, her two children (and Grandma herself) Pierce Brosnan discovers, to his horror, that a landfall has blocked his retreat. Too late! What to do when Grandma’s house is in serious danger of being atomised by that nasty erupting volcano yonder?
Our hero does the only logical thing, he loads his comrades into an aluminium dingy and sets off across the lake. Of course there’s a hitch. The dingy begins to dissolve. Why? And does this proposition measure up to our Hollywood Scientists?
In the movie, gases are bubbling up through the bottom of the lake, and it is these gases that turn the water into acid. How? An erupting volcano will release gases, fragmented rock and heat into the atmosphere. 
Most of this gas is simply water vapour (H2O), carbon dioxide (CO2) and sulphur dioxide (SO2).
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