The pouring out of the magma or molten rock through ground surface is
called a volcanic eruption .
A loud rumbling noise precedes
a volcanic eruption and the surrounding area experiences tremors .The ground temperature also rises in that area .
At the time of eruption ,
the magma , steam , fragments of rock , dust , and gaseous substances are ejected with great force from beneath the ground
surface through a pipe – like passage .
The opening of this pipe
on the earth’s surface is
known as the vent which forms a crater . The lava which is thrown into the skyduring an eruption , falls to the ground in the form of solid fragments .