CAUSES
what is subduction
one plate goes under another
what is lava?
Molten rock outside
what is a magma?
molten rock inside earth
why do volcanoes erupt
pressure breaks crust
what is the largest volcano on earth
mauna loa
what is a divergent boundary
plates move apart
what does ash cause?
breathing problems
what is a crater?
the top opening
where are most volcanoes
pacific ring of fire
which volcano destroyed pompéii
mount vesuvius
what are hot spots
rising mantle magma areas
what are pyroclastic flows?
hot fast ash clouds
what is a magma chamber?
underground magma storage
how does magma rise
plate movement pressure
which country has many volcanoes
indonesia
what causes eruptions
gas, perssure buildup
what are lahars?
volcanic mudflows
what is dormant?
sleeping but active possible
when is a volcano extinct
no future eruptions expected
what causes volcanic lightning
static electricity
what forms volcanoes
tectonic plate movement
what is a tsunami
a giant sea wave
what is a shield volcano
wide, gentle volcano
how do volcanoes help soil
ash makes it fertile
new islands