例句與造句

1. Recent erosion in the area removed the overlying shales and again exposed the limestone to groundwater action which produced collapse breccias which include fragments of the dike rock.
2. In simple craters, the original excavation cavity is overlain by a lens of collapse breccia, ejecta and melt rock, and a portion of the central crater floor may sometimes be flat.
3. Largely because of their relatively high ore grade and compactness, the United States Geological Survey anticipates that Arizona collapse breccia pipes will be  & the major source of future uranium production within the United States ."
4. The surface disturbance of collapse breccia pipe uranium mining has historically been remarkably small because of the high-grade, compact nature of the mineralization and use of underground waste rock back-fill procedures during breccia pipe mine development work.
5. The reason for uranium exploration and uranium mining in northern Arizona, during a period of low yellowcake price, was the high grade and compact nature of the uranium mineralization contained in some of the collapse breccia pipes in the region.
6. It's difficult to find collapse breccia in a sentence. 用collapse breccia造句挺難的