The temperature of volcanic gases is very high.

火山气体的温度很高。

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This is similar to the hot volcanic gases drag up the clouds of dark ash.

这和火山炙热气体掀起火山灰云非常相似。

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Volcanic gases and magma heat the groundwater, turning it in a hot acid that dissolves rock into a slurry of mud and clay.

火山气体与岩浆加热地下水，使之变成一种高温的酸性水，将演岩石溶解为泥浆。

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The researchers suggest that while the upper layers of Messel Lake were hospitable enough to allow turtles to live, its deeper layers may have been a toxic death trap, perhaps from the buildup of volcanic gases or poisonous decaying organic matter.

MSN: Fossilized turtles' sex act frozen in time - Technology & science - Science - LiveScience | NBC News

They will analyse the planet's lower atmosphere, looking for telltale gases associated with volcanic activity, and for related temperature changes.

ECONOMIST: Planetary science