What type of rock is identified by the presence of layers (beds)?

What type of rock is identified by the presence of layers (beds)?

• A. Metamorphic rock
• B. Sedimentary rock
• C. Igneous rock
• D. Granite rock

Answer: (B)

Sedimentary rock is characterized by its formation through the accumulation and compaction of mineral and organic particles over time, which leads to the development of distinct layers or beds. This layering occurs as sediments are deposited in water bodies such as rivers, lakes, and oceans, where they can accumulate in varying environments and over different time periods. The subsequent compaction and cementation of these sediments create the layered structure typical of sedimentary rocks. Examples of sedimentary rocks include sandstone, limestone, and shale, all of which prominently display this bedded appearance. In contrast, metamorphic rock is formed through the alteration of existing rocks under heat and pressure, often leading to a more homogenous appearance without distinct layering. Igneous rock forms from the solidification of molten material, either beneath the Earth’s surface (intrusive) or at the surface through volcanic activity (extrusive), and typically lacks the layering found in sedimentary rocks. Granite is a specific type of igneous rock, known for its coarse-grained texture and lack of layers, making it distinct from sedimentary rock.

Sedimentary rock is characterized by its formation through the accumulation and compaction of mineral and organic particles over time, which leads to the development of distinct layers or beds. This layering occurs as sediments are deposited in water bodies such as rivers, lakes, and oceans, where they can accumulate in varying environments and over different time periods. The subsequent compaction and cementation of these sediments create the layered structure typical of sedimentary rocks. Examples of sedimentary rocks include sandstone, limestone, and shale, all of which prominently display this bedded appearance.

In contrast, metamorphic rock is formed through the alteration of existing rocks under heat and pressure, often leading to a more homogenous appearance without distinct layering. Igneous rock forms from the solidification of molten material, either beneath the Earth’s surface (intrusive) or at the surface through volcanic activity (extrusive), and typically lacks the layering found in sedimentary rocks. Granite is a specific type of igneous rock, known for its coarse-grained texture and lack of layers, making it distinct from sedimentary rock.