isopachy map of coal seam

例句：

1. 1. The isopachy map of the coal seamshows the distribution of minerals in the rock.
   煤层的均匀地图显示了岩石中矿物质的分布。
2. 2. The isopachymap is used to determine the thickness andquality of the coal seam.
   均匀地图用于确定煤层厚度和质量。
3. 3.The isopachy map helps geologistsunderstand the structure of the earth'scrust.
   均匀地图帮助地质学家理解地球地壳的结构。