Dana Classification

The Dana Classification system is a way to categorize rocks based on how they formed. It groups rocks into three main types: igneous (formed from cooled magma or lava), sedimentary (formed from particles that settle and solidify), and metamorphic (formed from existing rocks changed by heat and pressure). Each main type is further divided into subgroups based on specific characteristics, such as texture or mineral content. This system helps geologists understand the origin and history of rocks, providing a structured way to study Earth's crust.