Only slightly warm liquid. Hot spring water whose temperature is lower than body heat (99 degrees). You can stay for long in the tub.

[After Ultra-Plinian Eruption] McCauley Hot Springs

Do you know what ultra-Plinian eruption is?

Volcanic activities sometimes have destructive influence on human society.

Out of them, ultra-Plinian eruption brings on a particularly large explosion that causes global change in environment and mass extinction.

Around such supervolcano, hot springs have been gushing over one million years after the eruption.

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