Source of Hot Lava
This page is the CodyCross answer for the clue below from Greece, Group 661, Puzzle 1 (Ancient Ruins).
Question is: Source of Hot Lava
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.