Often underground waters come to the surface in the form of a source, the waters of which are not only

Often underground waters come to the surface in the form of a source, the waters of which are not only clean, but also very cold. Why do you think?

In each locality, the soil freezes and heats up to its own depth – several meters. There are places where “permafrost” is. But there is always (with rare exceptions) there is a depth where the temperature is practically constant. In summer, water from this layer will appear cold.