eruptions are explosive. During
this type of eruption new lava fragmentssail through the air, but the fragments do not become rounded.
This is because the lava pieces have cooled off enough for the
shape to not change. Breadcrust bombs and blocks are thrown
out of the volcano during a vulcanian eruption. The minerals
in the magma of volcanoes that have vulcanian eruptions are
made up of andesite and dacite.