👉 A volcano is a high mountain or plate tectonic boundary where magma, lava and ash flow out of fissures. Volcanoes are the largest landforms on Earth, and they can release large amounts of toxic gases such as sulfur dioxide (SO2) and nitrogen oxides (NOx). Volcanic activity is characterized by a continuous eruption of gas and rock that erupts from the vent openings of the volcano. The eruptions can be explosive or gradual, and they can produce lava
