Here's why:
* Sedimentary rocks form from sediments: These sediments are tiny particles of rock, minerals, or organic matter that are transported by wind, water, or ice.
* Deposition: As the transporting force loses energy (e.g., a river slowing down), the sediments settle out in layers. Heavier, coarser sediments settle first, followed by finer materials.
* Compaction and cementation: Over time, the weight of overlying sediments compresses the layers and dissolved minerals in groundwater act as a cement, binding the particles together, forming solid rock.
This layered appearance, also called bedding, is a key characteristic of many sedimentary rocks.
