Foehn wind environment with strong and gusty winds. Explanations of the foehn warming and drying effect in popular literature or on the web often single out just one causal mechanism (#1 - Condensation and Precipitation - in the below), but there are in fact four known causes (illustrated in the schematic at top right of this page). These mechanisms often act together, with their contributions varying depending on the size and shape of the mountain barrier and on the meteorological conditions, for example the upstream wind speed, temperature and humidity. 1) Condensation and precipitation: When air is forced upwards over elevated terrain,
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