Other key features to consider are a mountainous climate and vegetation. The mountain climate is cooler and wetter than the plain, as the temperature drops at a rate of approximately 5 every 1 km in altitude and rainfall will increase with height because the so-called “screen effect”, although commonly found in mountainous areas wetter slopes (exposed to moist winds), compared with drier, in which those same winds have lost elevation and moisture tend to absorb the existing floor, a phenomenon known as “foehn effect “Such is the phenomenon that occurs in the Pyrenees, where the northern slope is wetter than the Spanish or South. The mountain vegetation is stepwise or floors.In the lower floors can find similar vegetation to that of the surrounding plain, but as you ascend hygrophilous species are appearing and more resistant to cold after the last tree species appears followed by the rocky alpine meadows and even perpetual snow. The species in each of these stories and the altitude at which we find vary by continent and also with latitude, it is not the same thing over mountainous sub-arctic areas in the tropics. The Rocky Mountains are a moderate amount of precipitation as rain, especially during the winter months. The meadows cover the lower levels and give way to large conifer forests. Above wooded grasslands and shrubs extend isolated. The tops of the peaks have little vegetation and some are covered with snow and ice all year round.