Prior to 1960, geologists Bowen and Hess disagreed over whether or not the very high temperatures needed to produce magmas rich in magnesium could have existed on Earth.
在1960年之前，地质学家鲍温和赫斯在地球上是否存在产生富含镁的岩浆所需的高温这一问题上存在分歧。
2
How does Etna produce its fiery mix of magmas?
埃特纳如何制造出它炙热的混合岩浆呢？
3
Normally, he said, volcanologists have to do "postmortem studies" of long-solidified magmas or study active lava.