翻訳と辞書 Words near each other ・ Laurel Awards ・ Laurel Bay Plantation ・ Laurel Bay, South Carolina ・ Laurel Black Cats ・ Laurel Bloomery, Tennessee ・ Laurel Braitman ・ Laurel Branch, Virginia ・ Laurel Branch, West Virginia ・ Laurel Broten ・ Laurel Burch ・ Laurel Canyon (disambiguation) ・ Laurel Canyon (film) ・ Laurel Canyon (Los Angeles Metro station) ・ Laurel Canyon Boulevard ・ Laurel Canyon, Los Angeles ・ Laurel Caverns ・ Laurel Christian High School ・ Laurel Clark ・ Laurel Complex ・ Laurel County, Kentucky ・ Laurel Creek Covered Bridge ・ Laurel Creek Gorge Bridge ・ Laurel Creek, West Virginia ・ Laurel dace ・ Laurel Dale, West Virginia ・ Laurel Dell, California ・ Laurel E. Youmans ・ Laurel Elizabeth Keyes ・ Laurel Falls Trail ・ Laurel Farms, New Jersey 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 Laurel Caverns ： ウィキペディア英語版 Laurel Caverns Laurel Caverns, formerly known as Dulaney's Cave and Laurel Hill Cave, is the largest cave in Pennsylvania. Located in Farmington, Pennsylvania; it sits on Chestnut Ridge near Uniontown, about southeast of Pittsburgh. Laurel Caverns is a privately owned show cave with a three-hour-long guided tour penetrating 46 stories deep into the mountain interior. Its difference is that it is not a high calcium limestone cave, but rather a low calcium limestone made up of 70% silica grains cemented together with 30% calcium carbonate and a small amount of iron oxide. The cave formed when the calcium carbonate was dissolved by groundwater allowing the silica to be washed away. This gives the cave rough walls, a sandy floor, and very few formations normally seen in the more common high calcium limestone caves. Laurel Caverns was also formed in an area of folded and fractured rock. Because of this, the entire cave is tilted thirteen degrees, resulting in many steep passageways. They tend to follow the fractures in the rock, resulting in a grid of long passageways. The cave has been known to history since the 18th century, and probably used by the Native Americans long before that. It is home to many bats and stays at a temperature of 12°C (52°F) year round. The steep slope of some passageways causes an interesting optical illusion known as a gravity hill. The brain is confused and tends to underestimate the slope. A demonstration in which a ball appears to roll uphill illustrates this. ==References== 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「Laurel Caverns」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.