caption: a diagram to show what the volcanic ash falls are
exif: {"Image DocumentName": "Volcanic Ash FallsCan also be used to correlate rock layers over a large area. Ash is a good indicator because:", "Image ImageDescription": "The ash from one explosion has distinct characteristics. ash can be deposited around the globe. The event occurs at one, geologically brief, time.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}