SO! i just found out that the Yellowstone National Park in Wyoming (extending to Idaho and Montana), United States, holds 2 active supervolcanos overlapping each other. "So, what's the big deal?", you may ask me.
supervolcanos are known for its destructive abilities which are in many ways are greater and more terrible than normal volcanos. what makes these supervolcanos which Yellowstone National Park holds more dangerous is that they contain magma that is rich in sulfur. this means, if they were to erupt, it'd generate an extremely super uber huge explosion. the opposite might occur though, if the magma is rich in basalt instead. explosion of supervolcanos such as that of Lake Toba, Sumatra, had been thought to cause the Millenial Ice Age ~75000 years ago which lasted for almost 1000 years and wiped out about 60% human population, Wallahua'lam.