Figure 1From: Incidence of cancer among residents of high temperature geothermal areas in Iceland: a census based study 1981 to 2010 Geological map of Iceland, showing the distribution of natural geothermal activity and the age of bedrock. Modified with permission from National Energy Authority. Small circles low temperature geothermal field, large circles high temperature geothermal field, age of bedrock: < 0.8, to gray 0.8-3.3, to light gray 3.3-15, and white glaciers.Back to article page