1. Sand and gravel is a word, pronounced shā lì, referring to sand and gravel. A sediment that is smaller than rock particles but rougher than chalk, the diameter of the chalk particles is between 0.06 and 2.0 millimeters. It is formed by weathering and stripping of rocks.

2, sand and gravel. The Records of the Grand Historian - General Wei Hussar Liezhuan: "The gale arose, sand and gravel struck the face, and the two armies did not see each other." The Southern History - Hidden Yi Biography - Kong Dao Hui ":" I tasted the valley there are hundreds of dendrobium money, see it as a tile stone is not different. Woodcutters competed to take it, and it became gravel in their hands." Song Chao Tuanzhi (宋晁补之) "And Guan Yanyuan's Autumn Wind Blows My Clothes": "But I see the Yellow River roaring and running to Jieshi, and the autumn wind blowing the sand and gravel on the beach." Qu Qiubai, "Chronicle of the Hungry Countryside" (《饿乡纪程》十六)："The frozen ice rips and cracks, and the flying gravel sweeps away in gusts."