1. Weathering: Rocks at the Earth's surface are broken down by processes like wind, rain, and temperature changes. This produces smaller fragments called sediment.
2. Erosion: The sediment is transported away from its original location by wind, water, or ice.
3. Deposition: The sediment eventually comes to rest in a new location, often in layers.
4. Compaction: As more sediment accumulates, the weight of the overlying layers presses down on the lower layers, squeezing out water and air, and compacting the sediment.
5. Cementation: This is where the magic happens! Water seeping through the compacted sediment carries dissolved minerals. These minerals precipitate out of the water, filling the spaces between the sediment particles and acting as a natural glue, binding the particles together.
Common minerals involved in cementation:
* Calcite (CaCO3): From the dissolution of limestone or shells.
* Silica (SiO2): From the dissolution of quartz or other silica-rich minerals.
* Iron oxides: Give rocks a rusty color.
* Clay minerals: From the weathering of feldspars and other silicate minerals.
The result: Cementation transforms loose sediment into solid rock, known as sedimentary rock. This process is responsible for the formation of a wide variety of rocks, including sandstone, limestone, and shale.
