fissure eruptions Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. openings in the ground that release lava and gases. Example Sentence Volcanoes can have fissure eruptions. More Example Sentences Fissure eruptions can happen unexpectedly. Synonyms lava flow; volcanic eruption; crack Antonyms sealed; closed Hear It! Say It! Write It! fissure eruptions Switch to cursive Start Share with your friends: