pumice volcanach

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Téann an t-ábhar seo go dtí thart ar dhromchla na hÉireann, agus ansin éiríonn sé suas nuair a bhíonn tine cruaith i gceist mar a dúirtar cheana. Fuaróidh an magmá agus bíonn pointe ann a chloítear an magmá nuair a théann sé níos gaire don dhromchla. Cruthaítear na búbail seo, agus nuair a théann an magmá suas, cuirtear poca gháis le fágáil laistigh den magmá a éireoidh agus a scaoileann ceantair pháimicé (beag beann ar lú sainmhéide ná uisce), pábháilte agus scintilí isteach sa aer. Imlíonn na ceantair pháimice seo go tapa ar ais ar an talamh mar chloch fhraoimheach, éadrom.