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The paper describes results from 18 months data collection and analogue modeling of “rain water – calcrete” interaction. The expe riment is based on leaching by natural rain and snow-melting water of material from diff erent soil and undersoil layers, containing various amounts of carbonates. It confirme d that rain and snow-melting water, circulating through the soil, undersoil and the underlying rocks, dissolves calcium rich minerals. Under dry weather and relativel y high temperature the hydrogen carbonat...