When the sun rises over the mountains, the air is still cool, meaning that by the end of the day, when the sun has crossed the main ridge and gives light to the other side the air is hot and dry. This means that trees growing on the northeast face of any given mountains flourish, while the southwest face is generally left barren-
there are, however, always a few brave tufts of foliage who dare to challenge the infernal heat and survive.