Two geologists discovered that about half of the sand from the Grand Canyon was actually once part of the Appalachian Mountains.
两位地质学家发现，约半数的来自大峡谷的沙子实际上曾经是阿巴拉契亚山脉的一部分。
We are camped next to a canyon that has been dammed by sand from a larger river.
我们在靠近峡谷的地方安营扎寨了，一片沙丘把这个峡谷和一条更大的河流挡隔开来。湖水蔓延到峡谷深处。
Floods from melting glaciers helped carve this canyon, deepening it and removing most of its sand and gravel.
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。
Floods from melting glaciers helped carve this canyon, deepening it and removing most of its sand and gravel.
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。
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