caption: The Iron Industry The problem =
exif: {"Image DocumentName": "The Iron Industry The problem =", "Image ImageDescription": "How to obtain pure iron from iron ore (rock with various minerals, but a high percentage of iron). Limonite - Fe2O3 + H2O to 66 % iron. Siderite - FeCO % iron. Hematite - Fe2O % iron. Magnetite - Fe3O4. \u2013 72 % iron.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}