A volcano is a disaster waiting to happen, as it can suddenly erupt with no warning. Most of the time, however, a dark cloud begins to emanate from the volcano's "mouth" a few turns in advance of an eruption -- but such a warning cannot be guaranteed. Rest assured, however, once you notice a volcano beginning to smolder an eruption is in the offing. Lava Flow When a volcano erupts it spews forth lava -- in the form of pollution -- that will mar the landscape of many of the tiles adjacent to the volcanic mountain. Volcanic "fallout" can be cleaned up by workers set to clean up damage.