volcanism

His study of eruptions over the past 300 years with Ben Mason of the University of Cambridge and colleagues reveals that volcanism varies with the seasons.

他和剑桥大学的本.梅森及其同事研究了过去300年来发生的火山喷发，研究显示火山活动随季节变化而不同。

Both kinds of plate boundary are associated with fault systems, earthquakes and volcanism, but the kinds of geologic activity observed at the two boundaries are quite different.

两种板块边界均与地层系统、地震以及火山活动有关，但在两种边界处观察到的诸般地质活动 却迥然不同。