1. Weathering:
* Physical Weathering: Igneous rocks are exposed to the elements. Things like wind, rain, ice, and temperature changes break the rock down into smaller pieces (fragments).
* Chemical Weathering: Rainwater, acidic solutions, and oxygen can react with the minerals in the igneous rock, altering their composition and weakening the rock. This can dissolve some minerals and create new ones.
2. Erosion:
* The weathered rock fragments are carried away from their original location by wind, water, or ice. This process transports the pieces and can round their edges.
3. Deposition:
* The transported fragments eventually settle in a new location, often in a low-lying area like a lake, ocean, or riverbed. These deposits can be sorted by size and weight, leading to layers of different sediment types.
4. Compaction:
* As more layers of sediment accumulate on top, the weight of the overlying material presses down on the lower layers, squeezing out water and air. This compacts the sediment together.
5. Cementation:
* Dissolved minerals from the surrounding water seep into the spaces between sediment grains. These minerals crystallize and act as a "glue," binding the fragments together.
6. Lithification:
* The combination of compaction and cementation turns the loose sediment into a solid rock. This process is called lithification.
Examples:
* Granite: A common igneous rock can weather into sand grains. These grains, deposited and lithified, can form sandstone.
* Basalt: Weathering of basalt can create clay minerals, which can accumulate and form shale.
Important Note: The transition from igneous to sedimentary rock is a long and slow process. It often involves multiple cycles of weathering, erosion, deposition, and lithification over millions of years.
