/media/static/sites/homepage/assets/resource_carousel/css/flash.css/media/static/sites/homepage/assets/resource_carousel/assets.swftruejavascript:popout(%state%);true2/fake_tokenizer/5678javascript:trackingFcn(%module%, %page%);PREVNEXTPLAY ALLVIEW OPTIONSSHOW INFOHIDE INFOVIEW ALL SLIDESView All SlidesPOP-OUT PLAYERPRESENTATION MODEVIEW AS STAND-ALONE RESOURCESHOWHIDE NAVIGATIONPREVIOUS RESOURCENEXT RESOURCEPLAYPAUSEVOLUMEBACKSLIDES%low%-%high% OF %total%PREVIOUS PHOTONEXT PHOTOVIEW ALL PHOTOSVIEW FULL-SIZED IMAGE[ restricted access ]CANCELDOWNLOADCAPTIONS/SUBTITLESTERMS OF SERVICE]]> https://media.nationalgeographic.org/assets/photos/000/191/19125_r60x45.jpg?1f4d0cdc58dd818f31e272401c6d449cb4b5156e Aquifer Illustration https://media.nationalgeographic.org/assets/photos/000/191/19125_r60x45.jpg?1f4d0cdc58dd818f31e272401c6d449cb4b5156e Download https://media.nationalgeographic.org/assets/photos/000/191/19125.jpg https://media.nationalgeographic.org/assets/photos/000/191/19125.jpg Illustration by Tim Gunther This illustration shows the two most common types of aquifers, confined aquifers and unconfined aquifers. An unconfined aquifer can receive water directly from the surface, while a confined aquifer is trapped between two layers of rock. 990 743 https://media.nationalgeographic.org/assets/photos/000/191/19125_r60x45.jpg?1f4d0cdc58dd818f31e272401c6d449cb4b5156e Kerid Crater https://media.nationalgeographic.org/assets/photos/000/282/28260_r60x45.jpg?1f4d0cdc58dd818f31e272401c6d449cb4b5156e https://media.nationalgeographic.org/assets/photos/000/282/28260.jpg Photograph by Richard Feren, MyShot Kerid Crater, in Iceland, was formed by a collapsed magma chamber 6,500 years ago. The water level in the crater shows the top of the local water table. The water stored in the rocks beneath Kerid Crater forms an aquifer. 990 743 https://media.nationalgeographic.org/assets/photos/000/282/28260_r60x45.jpg?1f4d0cdc58dd818f31e272401c6d449cb4b5156e Well, Well, Well https://media.nationalgeographic.org/assets/photos/000/282/28261_c0-216-743-773_r60x45.jpg?476a82bb208fb9dee3029e54d474d5c0cd24d973 https://media.nationalgeographic.org/assets/photos/000/282/28261.jpg Photograph by Franc and Jean Shor A girl draws water from the village well in Ayios Theodhoros, Greece. Aquifers store water for drinking, hygiene, and industry. 743 990 https://media.nationalgeographic.org/assets/photos/000/282/28261_c0-216-743-773_r60x45.jpg?476a82bb208fb9dee3029e54d474d5c0cd24d973