Explosive Mountain
Puzzle 7 of Stay Cool Piece of Cake Pack
Question is: Explosive Mountain
and the answer is: VOLCANO
Word Meaning:
VOLCANO — A vent or fissure on the surface of a planet (usually in a mountainous form) with a magma chamber attached to the mantle of a planet or moon, periodically erupting forth lava and volcanic gases onto the surface.
Definitions from Wiktionary.