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Gang

Gange er oftest lavet af vulkansk materiale, de forekommer i bjergarter, der er der i forvejen. Gange kan også være af sedimentær sammensætning i en revne, der var der i forvejen. Gangen skærer igennem bjergarten, og den er vertikal eller næsten vertikal.

Vulkanske gange opstår på grund af trykket og stressen i undergrunden, hvilket medfører, at gange kan dannes i det nærliggende område. Det er nemt at genkende en gang, fordi den går på tværs af den geologiske lagserie.

For både gange og sill, der er lavet af vulkanske bjergarter gælder det, at de ofte danner søjler, på grund af nedkølingsprocessen.

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