Heavy metal rock is a genre of rock music that originated in the late 1960s and early 1970s. It is characterized by aggressive, driving rhythms and distorted guitar riffs, often accompanied by lyrics dealing with social and political issues. The term 'heavy metal' is derived from the ORE of the same name, which is an alloy of iron and other metals such as copper, zinc, and lead. The ORE is often used to make musical instruments, such as electric guitars, and is also used in the production of certain types of jewelry. The term 'heavy metal rock' was first used to describe a style of rock music in the early 1970s, and has since become a popular genre of music.