The Earth is layered. Most geologists believe that this layering originated primarily because: Group of answer choices The denser material fell together from space first, and then the less-dense material fell in later. The Earth has been separating bit-by-bit for billions of years as the cold oceanic slabs sink all the way to the center and pile up. The Moon flew out of the Earth after a great collision with a Mars-sized body, causing the Earth to spin faster and separate. The Earth partially or completely melted soon after it formed, and the denser materials fell to the center. The nine Supreme Court justices decreed that it separate, so, afraid of being arrested for breaking the law, it did.