Groundwater: Water located beneath the ground surface in soil pore spaces and in the fractures of geologic formations. A formation of rock or soil is called an aquifer when it can yield a usable quantity of water.
👇 ស្វែងរកឯកសាររៀននិងការងារគ្រប់ប្រភេទនៅទីនេះ៖
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