火山的热量将驱动化学反应，同时也能引起大量的蒸发。
Volcanic heat would drive the chemical reactions, as well as causing lots of evaporation.
岩浆抬升，在火山内部累积以及被挤压到地层的破裂位置——这些事件都会在岩浆从地表露头之前引发化学信号。
The rise of magma, its accumulation in Chambers, its propulsion into fractures-these events produce chemical signals that reach the surface well ahead of the magma itself.
这也是海洋形成其化学成份的例子之一：不只是从陆地上随江河流入海里，海底火山喷发时也给海洋注入新的化学成份。
This is also an example of how the ocean acquires its chemical makeup. It's not just run off from the continents, but also injection and chemical exchange caused by submarine volcanoes.
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