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eruptive

eruptive

7.9
Rock made when hot lava or ash cools
  • adjective
  • /ɪˈrʌptɪv/
  • Specialized
translation icon : eruptivo
  • The Hatepe eruptive sequence lasted about two weeks and did not undergo any major trace element compositional shift.

Examples

  • After the eruptive activity, the landscape was forever changed by layers of ash and debris.

  • Several of the eruptive deposits are modern-day building materials.

    Academic text (2008)
  • These estimates were supported by molecular dating of the formation of biogeographical barriers shaped by the eruptive events.

    Academic text (2011)
  • The eruptive nature of the volcano was evident as lava poured down its sides.

  • Scientists study eruptive rocks to understand the planet's volcanic history.

Synonyms

igneous
vseruptive
  • Specialized
4 7.4

Rock like granite that forms when hot, melted rock cools

focuses on formation by intense heat and volcanic action rather than only cooling
magmatic
vseruptive
  • Specialized
1 7.6

Relating to very hot liquid rock under the ground or things made from it

emphasizes formation by surface volcanic heat and fiery activity rather than deep magma origin
extrusive
vseruptive
  • Specialized
9.9

Rock that forms when lava from a volcano cools quickly on the ground, like basalt

is used for rocks formed by volcanic heat more broadly than only surface flows
pyrogenous
vseruptive
  • Specialized
9.9

Made by very high heat, for example in volcanoes

refers specifically to rocks formed by volcanic heat rather than any high temperature process
pyrogenic
vseruptive
  • Specialized
9.9

Formed by very high heat deep in the earth, often near volcanoes

applies more to volcanic rock formation specifically rather than all high temperature origins

Surface Forms

eruptive positive

Morphology

eruptive = erupt (transparent) = erupt + ive

The geological sense is a domain-specific use but remains a direct adjectival formation from 'erupt' + '-ive'.

Etymology

Eruptive comes from Latin erumpere (from e- 'out' + rumpere 'break'), meaning 'break out'. That fits eruptive rocks because they form when hot rock 'breaks out' of the earth and cools.