What Word, Derived From The Greek For 'Ash', Is Used To Refer Generally To Fragmental Material Ejected By A Volcano During An Eruption? Pyroclasts, Lapilli And Volcanic Bombs Are All Considered To Be Types Of This Material.'''

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1. What Word, Derived From The Greek For 'Ash', Is Used To Refer Generally To Fragmental Material Ejected By A Volcano During An Eruption? Pyroclasts, Lapilli And Volcanic Bombs Are All Considered To Be Types Of This Material.'''