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美國科羅拉多大峽谷絕美風(fēng)景

 海右觀瀾 2011-05-20
        

Grand Canyon

                

科羅拉多大峽谷位于美國亞利桑那州,是一個雙邊陡峭的沿科羅拉多河蔓延的峽谷。它面積廣闊,包括了美國第一個國家公園,科羅拉多大峽谷國家公園。全長277英里(446 km),19英里 (29 km) 寬,縱深超過了1英里(6000英寸/1800米)。在地球地質(zhì)演化史的近20億年內(nèi),隨著科羅拉多高原的不斷被抬高,它也在連續(xù)不斷接受著科羅拉多河以及眾多支流一層又一層的沖刷。關(guān)于科羅拉多大峽谷的具體地質(zhì)演化過程和形成時期仍然是一個備受地質(zhì)學(xué)家爭議的話題,最新證據(jù)表明,科羅拉多河至少是在1700萬年前流經(jīng)大峽谷的,而從那時起,這里通過科羅拉多河經(jīng)年累月的侵蝕,便形成了大峽谷現(xiàn)在的地質(zhì)面貌。

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