Rockformations jut from the floor of the Grand Canyon of YellowstoneNational Park. Floods from melting glaciers helped carve this canyon,deepening it and removing most of its sand and gravel.

• 意译：峡谷照片美术馆。岩层突出所提的黄石国家公园的大峡谷。洪水从冰川融化帮助雕刻这个峡谷，加深它，并消除其大部分沙和碎石。