ER stands for Extended Range These aircraft types that is identified by 'ER' are aircraft models that is enhanced for better efficiency at long range flights than its counterpart aircraft of the same model. Source(s): Aerospace Engineer - Aviation Enthusiast
exists and is an alternate of . The difference is that windward gets more rain, is wetter, and is the side of the mountain that is closest to the ocean. On the other hand the leeward is the farthest from shore and is drier but still gets rain.
By 'face', the mean the sides of the dunes. All sand dunes have what is called a windward side (facing the wind or facing upwind) and an opposite leeward side (facing downwind). The sand blown on the windward side blows along the top until it gets deposited on the crest of the dune.