The volcanoes, known as supervolcanoes, are capable of producing eruptions that dwarf those of any other volcano on Earth.
Scientists previously thought that supervolcanoes were formed by the same processes that create other volcanoes, but on a larger scale.
However, new research has shown that supervolcanoes are actually formed by a completely different process.
The research, published in the journal Nature Geoscience, shows that supervolcanoes are formed when magma rises to the surface of the Earth and spreads out over a large area.
This magma then cools and solidifies, forming a large, flat-topped volcano.
As more magma rises to the surface, it builds up on top of the existing volcano, eventually forming a supervolcano.
The research also showed that supervolcanoes are more likely to form in certain parts of the world, such as the western United States and the Yellowstone region.
This is because these areas have a lot of volcanic activity, and the crust is thinner than in other parts of the world.
The research is important because it helps scientists to better understand the risks associated with supervolcanoes.
By knowing how supervolcanoes form, scientists can better predict when and where they might occur, and they can take steps to mitigate the risks.
Supervolcanoes are rare, but they can have devastating consequences.
The most recent supervolcano eruption occurred in 1815 at Mount Tambora in Indonesia.
The eruption killed an estimated 71,000 people and caused global climate change.
If a supervolcano were to erupt today, the consequences could be even more devastating.
The research into supervolcanoes is helping scientists to better understand these risks, and it is making the world a safer place.
