地下水离地面深浅不一,浅者从几米到几十米,深则在几百米地层以下才有水。地下水的来源有雨水、地面积雪的融化渗透,空气中的水蒸气,当土壤湿度比空气湿度低,水气也能钻入地下,凝结在土壤颗粒上,成为地下水。同时地层深处岩浆中含有水蒸气,当它上升到地壳上层,也可凝结成地下水,不过这部分水所占的比例极小。另外,在地质变迁中,还 Groundwater depth varies from the ground, shallow from a few meters to tens of meters, deep in the water below hundreds of meters of formation. The sources of groundwater are rainwater, ground snowmelt infiltration, water vapor in the air, when the soil moisture is lower than the air humidity, the water vapor can also penetrate into the ground, condense on the soil particles and become groundwater. At the same time, the magma contains water vapor in the depths of the strata. When it rises to the upper crust, it can also condense into groundwater, but the proportion of this part of water is extremely small. In addition, in the geological changes, also