溶岩【ようがん】
lava
溶液【ようえき】
solution (liquid)
溶かす【とかす】
to dissolve, to melt
溶解【ようかい】
dissolution, dissolving, solution (e.g. chemical), melting, liquefying, fusion
水溶性【すいようせい】
water-soluble
溶鉱炉【ようこうろ】
smelting furnace, blast furnace
溶け込む【とけこむ】
to melt into, to dissolve into, to merge into, to blend into (surroundings), to fit in, to adapt to, to integrate