Igneous to Metamorphic Rocks:
* Heat and Pressure: Igneous rocks are buried deep within the Earth's crust. The intense heat and pressure from the surrounding rock layers cause the minerals in the igneous rock to recrystallize and rearrange their structure.
* Chemical Reactions: Fluids circulating within the crust can also react with the minerals in the igneous rock, causing chemical changes and forming new minerals.
* Examples: Granite (igneous) can become gneiss (metamorphic), basalt (igneous) can transform into schist (metamorphic).
Igneous to Sedimentary Rocks:
* Weathering and Erosion: Igneous rocks exposed at the Earth's surface are broken down by weathering (rain, wind, ice) and erosion (water, wind, glaciers). This creates smaller fragments called sediment.
* Transportation and Deposition: The sediment is transported by wind, water, or ice and eventually deposited in a new location, such as a lake bed, ocean floor, or river delta.
* Compaction and Cementation: Over time, the layers of sediment are buried under more sediment. The weight of the overlying layers compacts the sediment, squeezing out water and air. Dissolved minerals in the water precipitate between the sediment grains, cementing them together to form solid rock.
* Examples: Granite (igneous) can weather to sand, which can then become sandstone (sedimentary). Volcanic ash (igneous) can be deposited and form tuff (sedimentary).
Important Note: The process of transforming igneous rocks into metamorphic or sedimentary rocks is a long and gradual process. It can take millions of years for these changes to occur.
