In geology, a terrane is a segment of Earth's crust that is distinct in structure and geologic history from the other terranes adjoining it. Terranes are bounded by faults, or factures. That means they have likely been moved (by plate tectonics) and explains why they can be so different from other land formations around them. Continents grow in landmass as they accumulate, or accrete, terranes that collide with the continent through the crustal movement of plate tectonics. An "accreted terrane" is one that is permanently attached to a continental plate.