Llewellyn, Claire Geysers / Claire Llewellyn. - Chicago, IL : Heinemann Library, 2000. - 32p. - Geography starts . Explores the phenomenon of geysers, discussing their relationship with volcanic activity, the mechanics of how a geyser works, steam vents, hot springs, and mud pots. ISBN: 1575722046 LCCN: 99053325 Subjects--Topical Terms: Geysers