The only country that has one color flag is Libya and it consist simple green field with no other characteristics. This flag was adopted on November 11 in 1977 when Libya left the Federation of Arab Republics. The green color is national color of Libya and it shows their devotion to Islam. Libya is located [...]
Copper reacts when oxygen in the air on moderate temperature and format a light color brownish black coating on the surface. Generally air or oxygen have chemical reaction on copper oxide and gradually turn it into green. Significantly unlike iron that start getting rusty when it has oxidization, when copper has this process over the [...]