Oil is called oil, black gold, and crude oil. Oil can be defined as a black liquid that tends to green, a heavy, flammable liquid...
الاثنين، 29 مايو 2017
السبت، 27 مايو 2017
The iron
Iron is a chemical element and belongs to the minerals and atomic number 26, iron is the most elements presence in the land of t...
الجمعة، 26 مايو 2017
The phosphorus
Sources and benefits of phosphorus and its important functions Phosphorus is found in the blood at 4 - 7 mg / l. Phosphorus he...
الأحد، 3 يوليو 2016
The silver
White metal with a high degree of luster and can be refined and polished to a high degree. With the exception of gold, silver is...