A Volcano is a cone shaped opening in the the ground. The vent is
the part where the lava, ash, and sometimes rocks come out when a volcano
is active. The word volcano is the cone or the vent. A volcanologists
is a person who studies volcanoes all over the world. They can sometimes
predict when a volcano is going to errupt so it doesn't hurt anybody.
The word volcanology is the study of volcanoes. So if you want to be a volcanologist you have to study it. But when a volcano errupts it lets out a gaseous particle into the air. Those little particles are called aerosal. When a volcano is active it can blast, or errupt shooting ash and lava very high in to the air, that it starts to cool and when it falls back on to the mountain, it forms the steep hill that you see on most volcanoes.
There are different types of volcanoes though. There is composit volcanoes which can shoot lava into the air and the lava can just flow out of the vent. A sheild volcano is a volcano that has lava that just flows out and it doesn't make a very stee volcanol. There is also a cinder cone where the volcano blows up. No matter what kind of volcano it is, they can still destroy.