sentences:  Because IOCM crust is thinner, denser, and more refractory than that beneath Andean-type margins, study of IOCM melts and fluids allows more confident assessment of mantle-to-crust fluxes and processes than is possible for Andean-type convergent margins.Because IOCMs are far removed from continents they are not affected by the large volume of alluvial and glacial sediments.The consequent thin sedimentary cover makes it much easier to study arc infrastructure and determine the mass and composition of subducted sediments.