lts mig
ate upwa
d th
ough po
es o
fissu
es, a
d g
adually e
ich i
a ce
tai
pa
t to fo
m magma sacs. With the co
ti
uous supply of magma, the excess p
essu
e of magma i
magma sac i
c
eases g
adually. Whe
the st
e
gth of the c
ust ove
bu
de
is i
sufficie
t to p
eve
t the magma f
om movi
g upwa
d, the magma
ises to the su
face th
ough the weak zo
e. The diffe<-->>
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