caption: a diagram showing the layers of a volcano
exif: {"Image DocumentName": "Potassium Argon Dating", "Image ImageDescription": "As lava comes out of volcanoes, gasses, including argon, are released. Thus when lava cools to form rock it should contain no argon. New layer of argon free volcanic rock over fossil baring. rock. Volcano.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}