This basic information about groundwater describes how it is used, how it gets into the ground (infiltration), and how it is able to move underground. The site describes the saturated zone and the top of this zone, which is called the water table. An aquifer is described, along with the role of groundwater in the water cycle. There is a section about groundwater contamination and a section that suggests other questions to ask about water. Text is supported with animated diagrams.