Nearly, 550 million years ago, Earth?s magnetic field was reduced to less than 10 percent of its strength today. Nearly, 550 million years ago, Earth?s magnetic field was reduced to less than 10 percent of its strength today.
Nearly, 550 million years ago, Earth?s magnetic field was reduced to less than 10 percent of its strength today. Nearly, 550 million years ago, Earth?s magnetic field was reduced to less than 10 percent of its strength today.