what happens immediately before a volcano erupts ?
a) magma collects in the mantle**
b) lava hardens to form volcanic rock
c) expanding gases pushes magma through the pipe
d) the temperature in the magma chamber decreases
a) magma collects in the mantle**
b) lava hardens to form volcanic rock
c) expanding gases pushes magma through the pipe
d) the temperature in the magma chamber decreases