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How external electromagnetic (EM) wave interacts with Soil is a large and comprehensive topic. Less researchers in the world concern about it. Before resolving it, we need to realize the following facts:
• Electromagnetic (EM) wave travelling in speed of light is generated by photon and has wave-particle duality.
• EM wave has magnetic field and electric field while it travels in a medium.
• The external magnetic field and electric field cause ions and molecules in electrolyte to be polarized. Such electrolyte is made from existing ionized minerals and degraded SOM (soil organic matter). Thus, there is a huge cell in groundwater system. The ions have a rather big mobility in cell, those ions also diffuse following the direction of flowing water. On the other hand, water is a polar molecule, that is why we can measure depth of ocean. Furthermore, ions have strong conductivity.
• Once the external magnetic field and electric field impose upon ions, molecules and complexes, a series of photons with certain wavelength is generated due to internal energy transition. If received signals are expressed by time series, the latter received signals certainly thought as the ones generated by photons emitted by mixtures locating deeper positons.
Based on above facts, some significant phenomena occurring ground water system can be discovered.