When did the biggest volcano eruption happen?

The biggest volcano eruption in the world's history occurred 250 million years ago when a supervolcano called the Siberian Traps erupted. This explosion was so violent that scientists believe it led to the extinction of 90 percent of plant and animal life on Earth at the time, according to Discovery.

The worst volcano eruption in human memory happened in Tambora, Indonesia, on April 10, 1815. The volcano erupted on Sumbawa Island, killing an estimated 70,000 to 100,000 people, according to Discovery. The cloud of ash from the volcano was so wide-ranging that it hung over Europe and North America through the summer of 1816.