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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Ethiopian xeric grasslands and shrublands ： ウィキペディア英語版 Ethiopian xeric grasslands and shrublands The Ethiopian xeric grasslands and shrublands ecoregion is a semi-desert strip on or near the Red Sea and the Gulf of Aden coasts in Eritrea, Ethiopia, Djibouti and Somalia. This ecoregion lies mainly between sea level and 800 meters (m) elevation. There are, however, many hills and massifs, which range up to 1300 m as well as outstanding fault-induced depressions, such as the Danakil, lying as low as 155 m below sea level. This region is extremely active tectonically, experiencing many earthquakes and intermittently active volcanoes. Rainfall is very low and yearly averages range from 100 to 200 millimeters (mm), with less rain falling closer to the coast. There are many species of interest, including the endemic Archer's lark (Heteromirafra archeri), a species of dragon tree (Dracaena ombet), and a large suite of desert ungulates, including the last viable population of African wild ass (Equus africanus somalicus). ==Location and description== This ecoregion extends inland from the Red Sea and the Gulf of Oman, including the Dahlak Archipelago and other islands, stretching from the Sudanese-Eritrean border, south through Ethiopia to Djibouti and eastwards into Somalia, in the Somaliland region of the country. While it mainly lies between sea level and 800 m, there are many arid hills and massifs up to 1300 m. Higher massifs such as the Goda and Mabla in Djibouti are considered to be outliers of the Ethiopian Montane Forest ecoregion. There are also fault-induced depressions, such as the Danakil Depression and Lac Assal, lying as much as 160 m below sea level. Elevation generally increases westward towards the Ethiopian and Eritrean highlands. The region is extremely active tectonically, and it experiences many earthquakes associated with the continuing enlargement of the Rift Valley. Volcanoes in the ecoregion are also intermittently active. Basement rocks are composed mainly of Tertiary lava flows, although there are also Quaternary basinal deposits at the northern end and pre-Cretaceous basinal deposits on the northern coast of Somalia. Soils developed over the lava deposits are mainly lithosols, while regosols are predominant on the Quaternary and pre-Cretaceous basinal deposits. There are very few permanent watercourses. The most notable is the Awash River of Ethiopia that terminates in a series of lakes near the border with Djibouti. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ethiopian xeric grasslands and shrublands」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.