< p >弗雷德所说的没有错,但我认为它不会回答这个问题很让我添加一些东西:< / p > < p >首先记住,水将始终遵循重力,所以当然是向下流动。接近海平面的区别之间的引力加速度几乎是零春天和大海。也大约海平面上最土风化,因此很厚,他们可以吸收大量的水。弗雷德已经说过那些“较低的河流”大多是公开的地下水位,没有真正的一个来源。< / p > < p >现在山脉上的区别。主要是你越薄越高土壤。因为几乎没有土壤没什么水,可以吸收。相反,它积累在海洋,直到墙休息时间和水开始向下流动。它将自然雕刻的基石。冰川还可以开拓大量的岩石和融化时创建河流流。< / p > < p >的“井”。我认为你的意思是一个山的水出来。 Remember mountains have in most cases higher precipitation and since not much water can be absorbed well it has to come down. When the water hits the ground it seeps through cracks in the rock to the inner mountain. The chemical weathering will cause especially CaCO3 - rich rocks (carbonates) to dissolve. This will create caves (Karst) where the water then accumulates. The water "flows" within the mountain and will at some point create a little hole in the mountain from within. That's where the water then flows out and becomes a river. I think that hole would be your well. I'll add a picture for better understanding:
