carbon di oxide & helium
There is no gases that comes out of a volcano that is not poisonous all gases that comes from a volcano is dangerous.
When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged.
yes
fumaroles
An "Active" volcano.
volcano
Hawaii
volcano
From Scientific American:"When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged. Although there are several factors triggering a volcanic eruption, three predominate:the buoyancy of the magma,the pressure from the exsolved gases in the magma andthe injection of a new batch of magma into an already filled magma chamber."You can read more about the process, below.
Gases in a volcano come from the magma underneath it, which contains dissolved gases like water vapor, carbon dioxide, and sulfur dioxide. When pressure builds up in the magma chamber, gases are released along with lava during an eruption. Lava is molten rock that comes from deep within the Earth's mantle and is pushed up through the volcano's vent during an eruption.
Volcano , (volcanic vent).
The vent of a volcano is called the crater. It is the opening at the top of the volcano through which lava, ash, and gases are expelled during an eruption.