We know that beneath its crater-pocked silicate crust, the moon has an olivine mantle and a metallic core. Some research has also suggested that a partially molten layer may lie at the base of the otherwise solid mantle, sandwiched between it and the solid core. But other evidence disagrees. We know that beneath its crater-pocked silicate crust, the moon has an olivine mantle and a metallic core. Some research has also suggested that a partially molten layer may lie at the base of the otherwise solid mantle, sandwiched between it and the solid core. But other evidence disagrees. Planetary Sciences Phys.org – latest science and technology news stories