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The hard starting problems of diesel engines in below zero / freezing temperatures are generated by two factors. One is the initial cold air being drawn in to the turbocharger and compressed in the engine?s cylinder head. The second is the fuel itself, is also cold and also this sub zero / freezing temperature fuel is sprayed to the cold engine?s combustion chamber, where it mixes while using cold air drawn thru turbocharger. There are many reasons why geology is vital in everyday life also to civilization. Think about earthquakes, landslides, floods, droughts, volcanic activity, ocean water currents (el Ni??o), varieties of soil, fuel oils, minerals (gold, silver, uranium), and so on. Geologists study these concepts. Thus, the study of geology plays an important role in modern life and civilization.