Clastic rocks are composed of individual fragments of mineral or rock. The fragments may range in size from huge boulders to microscopic particles.
碎屑岩是由岩石和矿物碎屑的单体组合而成，这些碎屑物质的粒度可以是巨大的确石到微细的颗粒。
2
Nitrogen and phosphorus are the necessary mineral nutrition to trees. They determine the growth of individual, the development of community and the productivity of ecosystem in the nature.
氮、磷是树木必需的矿质营养，在自然界中它们影响着树木个体的生长、群落的发育及整个生态系统的生产力。
3
Article 32 in mining mineral resources, a mining enterprise or individual must observe the legal provisions on environmental protection to prevent pollution of the environment.