Mercury interior

The internal structure of Mercury is dominated by a large solid iron core, and a liquid outer core of iron, sulphur and silicates. An iron-poor silicate mantle lies below a 10 km-thick silicate crust. An annotated version of this graphic is available here: http://www.esa.int/spaceinimages/Images/2017/04/Mercury_interior_annotated The surface of Mercury depicted in the graphic is based on images taken by NASA’s Messenger spacecraft.