Why is the hot spring slate bed hot?

The hot spring slate bed will heat up because there are hot springs flowing under the slate. Hot spring slate bed, also known as hot spring tropical and slate bath, usually lays a row of slate under the veranda. Hot spring water flowed down from the slate, and the slate was boiling hot. When people lie quietly on the slate, they will feel a special warmth and energy permeating the whole body. In some places, it is also extended to the reclining chair slate bath, which makes the human body more comfortable.