Mercury is mostly comprised of a large metallic core.

Name: Mercury is mostly comprised of a large metallic core.
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Mercury is known to have a very large metallic core, accounting for about 60% of its total mass. This core is believed to be mostly composed of iron, with smaller amounts of nickel and other elements. The outermost layer of the planet is a relatively thin crust, which may be just a few kilometers thick in some areas.

Mercury Is Mostly Comprised of a Large Metallic Core