Crosswordiee.com

% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Eruption output 4 letters:

LAVA: Eruption output, perhaps
LAVA: Eruption output
MOLTENLAVA: Eruption output
ASH: Output from an eruption
VOLCANICASH: Output from an eruption