What conditions are necessary for a geyser to form? Objective Students will: Be able to define a geyser Identify the ingredients necessary to form a geyser Create a model of a geyser Hypothesize which geyser model will most accurately represent a real geyser Evaluate different geyser models for their performance simulation of a real geyser Accept or reject hypotheses after viewing the eruption demonstrations Background A geyser is a hot spring that erupts periodically and forcibly ejects water. Three ingredients are necessary for a geyser to exist: a source of heat, an abundant supply of water Duration: 60 Minutes.