What mountains lie between northern italy and switzerland?

The Alp mountains lie between northern Italy and Switzerland. The Alp region of Switzerland is referred to as the Swiss Alps, while the Alp region in Italy is referred to as Italian Alps. The Alp region one of the largest and highest mountain ranges in the world and highest mountain region in Europe that is caused by uplift in the European Plate as it is impacted by the African Plate moving north. 

When the indian plate collided with eurasian plate because it was cool 

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.