Layers of varying thickness are found in which type of rock?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Sedimentary rock.
Sedimentary rock is the type characterized by layers of varying thickness, known as strata or bedding. These distinct layers form through the deposition and subsequent compaction and cementation of mineral and organic particles over long periods.
Each layer represents a specific episode of sediment accumulation, often from water or wind, with variations in material grain size, color, and composition creating the visible banding.
This stratification provides a valuable historical record of past environmental conditions. In contrast, igneous rocks form from cooled magma and are typically massive or crystalline, while metamorphic rocks can be foliated but lack the same type of distinct, depositional layering.