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It is categorized by the minerals included, its chemical composition, and the … In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. While there are many rock classifications (some overlapping), several terms and principles have remained widely accepted … · rocks are commonly divided into three major classes according to the processes that resulted in their formation. Rocks hold the history of the earth and the materials that will be used to build its future. There are three basic types of rock: Extremely common in the earths crust, igneous rocks are volcanic and form from molten material. · rocks are classified based on how they were formed. The three major types are igneous, sedimentary, and metamorphic rocks. They include not. Below is a list of major rock types that geologists recognize. This classification is essential to geologists as it … And with so many rocks everywhere around us, you may be surprised to learn that there’s really only three different kinds of rocks out there. Photos, descriptions and facts about intrusive and extrusive igneous rocks. Igneous, sedimentary, and metamorphic. Rocks are everywhere you look.