Foehn wind 3) Mechanical mixing: When river water passes over rocks, turbulence is generated in the form of rapids, and white water reveals the turbulent mixing of the water with the air above. Similarly, as air passes over mountains, turbulence occurs and the atmosphere is mixed in the vertical. This mixing generally leads to a downward warming and upward moistening of the cross-mountain airflow, and consequently to warmer, drier foehn winds in the valleys downwind. 4) Radiative warming: Dry foehn conditions are responsible for the occurrence of rain shadows in the lee of mountains, where clear, sunny conditions prevail. This often leads
What Is History? of things in the world, in a 1970 article entitled "Marxism and History", Carr argued that with the exception of the Mexican Revolution, every revolution in the last sixty-odd years had been led by Marxists. The other revolutions Carr counted were the revolutions in Cuba, China, Russia, and a half-revolution in Vietnam (presumably a reference to the then on-going Vietnam War). This together with what Carr saw as the miserable condition of the Third World, which comprised most of the world led Carr to argue that Marxism had the greatest appeal in the Third World, and was the most likely