Why can the fountain spray so high?

Most springs are distributed in valleys or low-lying areas. Where groundwater is abundant, cracks, cracks and caves are connected with groundwater, and below the groundwater level, spring water will flow out. Some springs are like a trickle, flowing continuously; Some of them spray so high that they can't spray.

It is not surprising that artificial fountains are controlled by people through electricity. The fountain of nature, nobody cares, how to spray?

The fountain has a direct access to the deep underground. The underground temperature is very high. When the temperature exceeds 100 degrees Celsius, some water can become steam. When the pressure of steam reaches a certain level, the water above the steam will be pushed out through the channel and sprayed into the air to become a fountain. This principle is similar to that of a steam engine train. The steam engine pushes the train forward or backward, not upward.