The principal that states that younger rocks lie above other rocks in the superposition principal.
Rock layers can be dated using radiometric dating because it can change how we think about them. This allows us to determine the relative ages of these rock layers.
Rock is a naturally occurring, cohesive aggregation of one or more minerals in geology. These aggregates often form recognisable and mappable volumes and make up the fundamental component of the solid Earth. According to the processes that led to their formation, rocks are typically categorized into three major classes.
These three categories of rocks are: (1) igneous rocks, which have crystallized from molten rock known as magma; (2) sedimentary rocks, which are made up of pieces of other rocks or of substances that have precipitated from solutions; and (3) metamorphic rocks, which have been created from either igneous or sedimentary rocks under conditions that have changed their mineralogical composition, texture, and internal structure. These three classes are further divided into multiple groups and types based on a variety of variables.
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