10 ADVANTAGES OF ROCKS TO HUMANKIND
Rocks are the accumulation of minerals in a solid state. However, rocks include substances like clay, sandstone, shells, and corals. Rocks that contain metallic compounds are called ores. The rocks of the crust are made up of eight main chemical elements; oxygen, silicon, iron, aluminum, calcium, potassium, sodium, and magnesium. The following are values of rock to man: Rocks are very important in the formation of soils that can be used for agricultural production. Rocks are used for building purposes: some rocks such as limestone, sandstone, gravel, and sand are used for building houses, construction of roads, etc. Some rocks are used as sources of energy or fuel such as coal and petroleum (mineral oil). Limestone is widely used for cement manufacturing. In Tanzania, cement is produced at Tanga, Mbeya and Wazo Hill. Salt extraction: salt usually originates from rock accruing strata, for instance, in Tunisia and Morocco there are large deposits of salt. Manufacturing of chemicals:...