Volcanoes release H2S, HCl, SO2, CO2, etc.
Volcanic gas?
The most common volcanic gas released in an eruption is water vapor. Water vapor is followed by carbon dioxide and sulfur gas.
No. Jupiter is a gas planet. It has no surface on which volcanoes might form.
pyroclastic flow
Volcanic matter includes lava, volcanic glass (obsidian) caused by the sudden cooling of lava, ash and cinders, mud and rock.
Compared with some other volcanoes around the world, the Hawaiian volcanoes are fed by low-viscosity magma with a low gas content. The explosive power of a volcanic eruption is driven by gas trapped in the magma, and magma that is more viscous allows more pressure to build up. The magma in the Hawaiian volcanoes flows out fairly readily.
Gas is what gives volcanoes most of their power. One of the reasons this happens is because the gas keeps expanding.
Hydrogen is a minor constituent of volcanic gas. This will burn in air to form water vapor. However, volcanic gas also includes water vapor anyway.
gas
No. Volcano is a noun describing a mountain or hole in the ground through which lava, ash, and gas can erupt. Volcanic is an adjective that means "of, relating to, or produced by a volcano or volcanoes."
sulphur
They cool earth, due to the ash and gas released.