A look at the composition of tiny crystals trapped inside erupted lava and ash at Yellowstone has suggested a partial answer, by providing new insight into how magma forms.

• 藉由研究黄石国家公园喷发熔岩与火山灰内的微小晶体，这个疑问获得了部份解答，也使我们对于岩浆的形成机制有了新的见解。