boulder-clay

英['bəʊldərkl'eɪ] 美['bəʊldərkl'eɪ]
  • 泥砾,冰砾泥
  • boulder n.大圆石;巨砾
  • ditch n.沟渠;壕沟vt.丢弃;坠入沟中;飞机(在海上)迫降vi.挖渠;飞机紧急降落
名词 boulder clay:
  1. unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together