Earth's Magnetic Field
{"Image DocumentName": "Earth\u2019s Magnetic Field", "Image ImageDescription": "The earth acts as a giant bar magnet. Earth\u2019s magnetic fields have reversed more than 177 times in the last 85 million years.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}