Earth's Fiery Depths Filled with Brimstone

Earth's inner core is a metallic mix of iron and light elements such as sulfur, hydrogen and silicon, a new study finds. This isn't the first time scientists have proposed that Earth's fiery depths are filled with brimstone, another name for sulfur. Researchers at Tohoku University in Sendai, Japan, mimicked the inner core in a laboratory equipped with a laser-heated diamond anvil cell.