Which rocks are formed by the alteration of Pre-existing rocks by great heat or pressure? By crictensDecember 14, 2021Every Day Science A: Igneous rocks B: Sedimentary rocks C: Metamorphic rocks D: Acid rocks Post navigation The ozone layer is present about 30miles (50 Km) in atmosphere above the Earth The stratum (layer) of atmosphere in which ozone layer lies is calledThe most abundant natural Iron Oxided are Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.