一枚岩[ichimaiiwa] monolith
火山岩[kazangan] volcanic rock
火成岩[kaseigan] igneous rock
かこう岩[kakougan] granite
岩塩[ganen] halite

岩屋[iwaya] cavern
岩角[iwakado] edge or corner of a stone
岩間[iwama] among rocks
岩山[iwayama] rocky mountain

熔く[toku] to dissolve (paint)
熔ける[tokeru] to melt
熔岩[yougan] lava
熔鉱炉[youkouro] smelting furnace
熔接[yousetsu] weld

熔融[youyuu] melting
熔解[youkai] melting
熔銑[yousen] molten iron
炉心熔融[roshinyouyuu] core meltdown
熔滓[youshi] slag