The lightnings electricity - cropmarks intensifier, highlighter, and developer of such cropmarks (deep structures), unidentifiable and unobtainable by any other method. Already Crawford himself observed, that in some years, on the fields appear vegetation symptoms that were not observable many years before nor afterwards, and within their means very correctly concluded, that the most likely it mostly depends on the influence of weather.
Hiyo inaweza kuwa visualized alama upinzani hata ukame, Hiyo Itakuwa vigumu sana kwa findable upelelezi duniani (uchunguzi kuchimba kwa kina mita, mbili au zaidi), Kwamba ni katika miaka ya Nishati na hakuna Kutolewa kwa kutokwa umeme si ka wakati wote, Wao ni pia kirefu kutokana na mimea na katika Own yao Wala chanya au hasi kuathiri mfumo mizizi yake, au kurekebisha tabia za udongo.