翻訳と辞書 Words near each other ・ Loes River ・ Loes Schutte ・ Loes Ypma ・ Loesch ・ Loesche GmbH ・ Loeseliastrum ・ Loeseliastrum depressum ・ Loeseliastrum matthewsii ・ Loeseliastrum schottii ・ Loesenera ・ Loesenera kalantha ・ Loesenera talbotii ・ Loeser ・ Loesje ・ Loess ・ Loess Hills ・ Loess Plateau ・ Loessl Sb.1 Münchener Eindekker ・ Loet Geutjes ・ Loet Leydesdorff ・ Loetoe monarch ・ Loetoeng Kasaroeng ・ Loeu ・ Loeuilly ・ Loevestein ・ Loevinger ・ Loevinger's stages of ego development ・ Loew Lake Unit, Kettle Moraine State Forest ・ Loew's Grand Theatre ・ Loew's Jersey Theatre Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Loess Hills ： ウィキペディア英語版 Loess Hills The Loess Hills are a formation of wind-deposited loess soil in the westernmost part of Iowa and Missouri along the Missouri River. ==Geology== The Loess (, , or ) Hills are generally located between east of the Missouri River channel. The Loess Hills rise above the flat plains forming a narrow band running north-south along the Missouri River.〔("Geology of the Loess Hills, Iowa" ), USGS〕 These hills are the first rise in land beyond the flood plain, forming something of a "front range" for Iowa, and parts of Missouri and Nebraska adjacent to the Missouri River. During the last Ice Age, glaciers advanced into the middle of North America, grinding underlying rock into dust-like "glacial flour." As temperatures warmed, the glaciers retreated and vast amounts of meltwater and sediment flooded the Missouri River Valley. The sediment was deposited on the flood plain, creating huge mud flats. When meltwaters receded, these mud flats were exposed. As they dried, the fine-grained silt was picked up by strong prevailing westerly winds. Huge dust clouds were moved and redeposited over broad areas. The heavier, coarser silt was deposited close to the Missouri River flood plain, forming vast dune fields. The dune fields were eventually stabilized by grass. Due to the erosive nature of loess soil and its ability to stand in vertical columns when dry, the stabilized dunes were eroded into the corrugated, sharply dissected bluffs we see today. The dominant features of this landscape are "peak and saddle" topography, "razor ridges" (narrow ridges, often less than wide, which fall off at near ninety-degree angles on either side for or more), and "cat-step" terraces (caused by the constant slumping and vertical sheering of the loess soil). The soil has a characteristic yellow hue and is generally broken down into several units based on the period of deposition (Loveland, Pisgah, Peoria). Loess is known locally as "sugar clay" because it can be extremely hard when dry, but when wet, loses all cohesion. The Loess Hills of Iowa are remarkable for the depth of the drift layer, often more than deep. The only comparable deposits of loess to such an extent are located in Shaanxi, China.〔 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「Loess Hills」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.