lava tube
vent
InsideanEruption
1
MagmarisesfrombelowEarth’s surface.
2
Risinggasesputpressureonthesealed vent.
3
Gasesexplode,breakingthe seal.
4
Ahotcolumnofvolcanicashandgasshootsintothe air.
5
Duringlargeeruptions,pyroclasticflowsmadeofgasandvolcanicmattermoveathigh speeds.
6
Lavaflowsslowlyacrossthe land.
7
Lahars,mixturesofwaterandash,moverapidlydownstreamsand rivers.
8
Oncethegaseshaveescaped,theexplosionends.Thesealcloses again.
Restart
magmaand gas
HowItWorks
TheplanwastohiketothetopofSantaMaría.Here,theteamcouldobservethelavadomefrom above.
InsidetheCalientedome,magmaandgaswererising.Beforeaneruption,theventofthedomeissealed.Magmaandgasesaretrapped.Pressurebuilds.Theseal breaks.
Whenthesealbreaks,gasisreleased.Magmaoozesoutaslava.It flowslikethickrivers.Ashisforcedhighintothe sky.
Thensomeofthematerialresettlesoverthevent.Theventsealsagain.Thepressurebeginstobuildagainuntilthenext eruption.