The material that is expelled in a volcanic eruption can be classified into three types:
- Volcanic gases, a mixture made mostly of steam, carbon dioxide, and a sulfur compound (either sulfur dioxide, SO 2, or hydrogen sulfide, H 2 S, depending on the temperature)
- Lava, the name of magma when it emerges and flows over the surface
- Tephra, particles of solid material of all shapes and sizes ejected and thrown through the air [50][51]
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