The coal it produces is mostly poor in quality and rich in ash; it should be washed before shipping to make it more efficient, but is not.
它所产的煤炭大部分质量差而灰尘多；要想提高这些煤炭的效率，在装运之前应该要清洗但它们并没有被清洗过。
They concluded that iron-rich ash falling on waters that are otherwise poor in iron can create conditions in which phytoplankton thrive.
他们推断落在平时缺乏铁质的水面上富含铁质的灰尘为浮游植物的大量生长创造了条件。
These rocks consist of fossil-rich layers containing rapidly evolving Marine organisms such as ammonites, interleaved with layers of volcanic ash.
这些岩层富含化石，其中有快速进化的海洋生物，比如鹦鹉螺化石，岩层与火山灰岩交错排列。
应用推荐