]> 13 14 18 22 5 6 4 5 492 455 45 35 6 6 2 2 20 20 18 17 9 10 30 26 2 3 0.03 0 492 557 0 1 2 3 4 6 2 2 0.780 1000. 20 19 3 4 12 12 1. 1000. 25 30 7 7 2 11 12 10 10 0 8 8 2 -1 3 -1 4 5 -1 1 597 622 16 15 125 82 700 400 1. 1000. 622 780 16 16 14 18 Tephra is a collective term (generally plural) used for all material -- regardless of size-- ejected during an explosive volcanic eruption. 0.78 6 390 5 455 390 5 0.03 622 557