2 19 little prince quote if they are well cleaned out volcanoes burn slow and steadily cant go down mantle b c before explosion it is a solid rock exsolution surface when magma isnt strong enough to keep gas bubbles in place we get an eruption gas moves out at really quick scale gas accelerates quickly and takes things with it into atmosphere where pressure 0 a lot of material comes back down and moves along surface some material goes into a different sphere with a diff pressure which allows it to stay in atmos phere and move further around world base surge ash cloud that builds when trust material comes really fast to surface and moves different material around when material comes back down it produces high energy base surge accounts for majority of damage not initial explosion itself goes up to 300m s if you add rain or water or other material it is worse and produces lahar hot and cold mixture of water and rock fragments flowing down the slopes of a volcano and or river valley biggest problem most destructive part is the fast moving lahars can be so fast it literally freezes people in place covered in rock ash Pompeii lake natural disasters relate to e o after specific explosion everyone is found dead what happened is that lake by volcano is den sity stratified lake and highest density is on top was sitting on top of crater CO2 was seeping into lake but it got trapped under top layer at a certain point pressure becomes too big and lower density material suddenly goes into area CO2 killed everyone solution create fountains with straw to bottom which allows CO2 to constantly come out put signs and CO2 detectors around lake too bad barely anyone can read