Where does “volcano surfing” come from?

volcano surfing (English) comes from English surfing, from English -ing, from Middle English -ynge, from Old English -ung, from Proto-Germanic -ungō — -ing, -ion. "Forms gerund nouns from verbs.".

Ancestry of “volcano surfing”, step by step

volcano surfing traces back through two separate lines of ancestry.

via English surfing

StepLanguageWordMeaning
1Englishsurfingpresent participle of surf; The pastime or sport...
2English-ingUsed to form gerunds, a type of verbal nouns,...
3Middle English-yngeAlternative form of -ing
4Old English-ungforming nouns from verbs, denoting verbal action...
5Proto-Germanic-ungō-ing, -ion. "Forms gerund nouns from verbs."

via English volcano

StepLanguageWordMeaning
1EnglishvolcanoA vent or fissure on the surface of a planet (usually in a mountainous form) with a magma chamber attached to the mantle of a planet or moon, periodically erupting forth lava and volcanic gases onto the surface
2Italianvulcanovolcano
3LatinVulcānusVulcan, the Roman god of fire and metalwork, considered equivalent to the Greek Hephaestus and various German and Celtic gods
4Ancient GreekὀδώνIonic form of ὀδούς
Every word from Proto-Germanic -ungō
volcano surfing — Etymology, Origin & Word History | Etymology Explorer