National Geographic Travelのインスタグラム(natgeotravel) - 1月30日 18時08分

Photo by @steven_gnam | Even during the heart of winter, we are reminded of the Earth’s innate fire. Rocks that would be cool to touch on the surface transform to heat under pressure. Water warms as it’s exposed to this heat and can resurface as hot springs. When we soak in these waters, we warm our core from the Earth’s core.
Here, families gather during the winter at a hot spring in Montana, near the active volcanic area of Yellowstone National Park.

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