cryovolcanism
/ˌkrʌɪə(ʊ)ˈvɒlkənɪz(ə)m/Astronomy
noun
Eruptive or intrusive processes analogous to volcanism occurring at low temperatures in the icy crusts of certain planets and satellites, typically involving liquid or gaseous water, methane, nitrogen, etc.
Origin
1980s. From cryo- + volcanism. Compare slightly later cryovolcanic.