How did Earth avoid a Mars-like fate? Ancient rocks hold clues
Rochester NY (SPX) Jul 26, 2022
Approximately 1,800 miles beneath our feet, swirling liquid iron in the Earth's outer core generates our planet's protective magnetic field. This magnetic field is invisible but is vital for life on Earth's surface because it shields the planet from solar wind-streams of radiation from the sun. About 565 million years ago, however, the magnetic field's strength decreased to 10 percent of i