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Mediterranean hydrodynamics are driven by three layers of water masses: a surface layer, an intermediate layer, and a deep layer that sinks to the bottom; a separate bottom layer is absent. Deepwater formation and exchange rates and the processes of heat and water exchange in the Mediterranean have provided useful models for studying the mechanisms of global climatic change. The surface layer has a thickness varying from roughly 250 to 1,000 feet (75 to 300 metres). This variable thickness is determined in the western basin by the presence of a minimum temperature at its lower limit. In the eastern basin ...(100 of 4421 words)