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Volcano Learning zone > Volcano Glossary

Scoria wikiScoria is ejected from a volcano and can be of basaltic to andesitic compositon. Its texture is full of gas bubbles set in a dark coloured lava rock caused by the escape of volcanic bubbles during the volcanic eruption. It can rain down on the surrounding slopes creating new cones.It can be black,red or even blue and has a low density but does not float. It is used a lot in road building.Scoria cone