1. Heat and Pressure (Metamorphism): When sedimentary rocks are buried deep underground, they are exposed to intense heat and pressure. This can cause them to recrystallize and change their texture and mineral composition. This process is called metamorphism, and it can transform sedimentary rocks into metamorphic rocks like marble or slate.
2. Weathering and Erosion: These processes break down sedimentary rocks at the Earth's surface. Wind, rain, ice, and even living organisms can cause physical and chemical changes that break down the rock into smaller fragments or dissolve minerals. This is how sedimentary rocks are formed in the first place, but further weathering and erosion can continue to alter them.
3. Cementation and Compaction (Diagenesis): These processes occur after sediment deposition. Compaction happens when the weight of overlying sediment compresses the layers below, squeezing out water and air. Cementation happens when dissolved minerals in groundwater precipitate between the sediment grains, binding them together to form solid rock. These processes are part of diagenesis, a broader term for all changes that occur to sediments after deposition.
