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Please explainvolcanic bombs that mark the rock as volcanic tuff

Please explainvolcanic bombs that mark the rock as volcanic tuff
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Possibly because it was a prison housing many French resistance members?I'm surprised there wasn't more damage from WW 2
You know when you see a volcano going off, there’s a huge plume and column of what they call ash. That falls to the ground and creates layers of ash ( fine rock particles from fine sand grain size up to grit) and in general that’s called tuff or tufa, a sedimentary rock. There are other types of deposits pushed out from a volcano such as a lahar, but we are just talking about tuff here.Please explain![]()
Possibly because it was a prison housing many French resistance members?
Its also a hotel IIRC?