Earth’s Core Might Contain Hidden Helium That Doesn’t Come From This World
Earth appears to be a chill blue planet, but deep down, it’s really a metalhead. Its outer core is mostly molten iron (and ...
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The Elements of Steel
Iron is the ... metallic element that exists in the ore of pyrolusite. When making steel, it reacts with sulfur and helps to increase the metal's resistance to heat. Atomic number 25, atomic ...