1. Irruption refers to a population increase, not a volcanic eruption.2. This decade also witnessed the irruption of television inside trading rooms. 3. In one chapter, " The Marxist Irruption : How and Why," 4. There has also been what White called " an irruption of snowy owls ." 5. It is a rare visitor to western Europe, usually arriving with an irruption of red crossbills. 6. Irruption of Digos in Bellerio, headquarters of the Northern League in Milan on 18 September 1996.7. Compared to the nineteenth century, southern irruptions in the New and Old World appear to have declined. 8. Irruptions ( sudden population increases ) can occur in some areas after rain or the movement of floodwaters.9. However, marsh tits seem not to perform the occasional irruptions that other members of the tit family do. 10. A population irruption occurred in 1978 into Indonesia, with Australian pelicans reaching Sulawesi, Java and possibly also Sumatra.
