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20.问:什么叫做地下水?地下水是怎样形成的?答:地下水就是埋藏在地表面以下的水源,地下水的来源,主要是靠降雨补给的。雨水降落到地面后,一部分顺着地面流走了,一部分受太阳热力的影响,又变为水蒸气回到天空去,另一部分,就是通过土壤颗粒之间的孔隙岩石裂涟等渗入地下,形成地下水源。21.问:什么叫含水层?什么叫不透水层?答:解答这个问题,必须先从陆地构造谈起。陆地是由一层层的岩层(或土层)购成的,有粘土层、沙土层、砾石层、基岩等,沙土层和砾石层里孔隙较大,并能蓄存大量的水,叫含水层或透水层,粘土层里的孔隙很小,含水少,几乎不透水,叫不透水层或
Q: What is groundwater? How is groundwater formed? A: Groundwater is the source of water that is buried beneath the ground surface. The source of groundwater is mainly recharged by rainfall. After the rainwater has landed on the ground, part of it flows down the ground and is partially affected by the heat of the sun and returns to the sky as water vapor. The other part is infiltrated into the ground through pore-rock ripping between soil particles and the like Groundwater source. 21. Q: What is an aquifer? What is an impermeable layer? A: To answer this question, we must first talk about the land structure. Land is a layer of rock (or soil) purchased, with clay, sand, gravel, bedrock, etc., sand and gravel layer pores larger, and can store a lot of water, called Aquifers or aquitards, the clay layer in the pores is small, less water, almost impermeable, called the impermeable layer or