1. Rock Formation (Igneous Phase):
- Igneous Rocks: Rocks that form when molten rock (magma or lava) cools and solidifies.
- Extrusive Igneous Rocks: Formed when magma cools quickly on the Earth's surface (e.g., basalt).
- Intrusive Igneous Rocks: Formed when magma cools slowly beneath the Earth's surface (e.g., granite).
2. Weathering and Sediment Formation (Sedimentary Phase):
- Weathering: The process of breaking down rocks into smaller pieces through physical, chemical, and biological means.
- Erosion: Transportation of weathered materials by wind, water, glaciers, etc.
- Deposition: Accumulation and settling of eroded materials to form sedimentary layers (sediments).
- Compaction: Compression of deposited sediments under overlying weight, leading to compaction.
- Cementation: Chemical bonding between sediment particles through the precipitation of minerals (e.g., calcite, silica) forms solid rocks.
3. Rock Transformation (Metamorphic Phase):
- Metamorphic Rocks: Formed when existing rocks (igneous, sedimentary, or previously formed metamorphic) undergo changes in their mineral composition, texture, or structure due to heat, pressure, and/or chemical reactions.
- Regional Metamorphism: Occurs over large areas due to deep burial, mountain-building processes, or plate tectonics.
- Contact Metamorphism: Localized changes caused by the heat of magma intruding into surrounding rocks.
- Hydrothermal Metamorphism: Caused by hot, mineral-rich fluids circulating through cracks in the rocks.
These three processes—igneous, sedimentary, and metamorphic—continuously recycle rocks by transforming one type into another. The rock cycle is driven by various geological forces and conditions and operates over vast time scales.
