Volcanoes are actually holes in the surface of the Earth. These punctures in the crust let magma from the core of the Earth bubble to the surface.
Due to the fact that volcanoes are holes in the surface of the Earth, volcanoes are frequently found at the edges of the Earth's tectonic plates.
The most famous volcanic eruptions of modern times include the eruption of Mount Pinatubo in 1991, Mount St Helens in 1980, Novarupta in 1912, and Mount Krakatoa in 1883.
The biggest known volcano in the solar system is on Mars. It's about 373 miles (600 kilometers) wide and 13 miles (21 kilometers) high.
The common gasses that are found when a volcano erupts are: water vapor, carbon dioxide, sulfur dioxide, hydrogen chloride, hydrogen fluoride, and hydrogen sulfide.
When a volcano erupts, it can send ash and debris up to 17 miles above the Earth's surface.
There is a unique volcanic rock called pumice that can float in water.