1. Igneous Rocks: These rocks are formed from the cooling and solidification of molten rock (magma or lava).
* Magma: Molten rock beneath the Earth's surface.
* Lava: Molten rock that erupts onto the Earth's surface.
2. Sedimentary Rocks: Formed from the accumulation and cementation of sediments (fragments of other rocks, minerals, or organic materials).
* Weathering: The process that breaks down existing rocks into smaller pieces.
* Erosion: The process of moving weathered rock fragments.
* Deposition: The process of sediments settling in a new location.
* Compaction: The weight of overlying sediments presses the sediments together.
* Cementation: Dissolved minerals in groundwater crystallize between the sediments, binding them together.
3. Metamorphic Rocks: Formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are subjected to intense heat and pressure.
* Heat and Pressure: These factors cause the minerals in the existing rock to recrystallize, changing their texture and composition.
The Rock Cycle in Action:
1. Igneous rocks can be weathered and eroded into sediments, which then form sedimentary rocks.
2. Igneous rocks can also be buried deep within the Earth, where they are subjected to heat and pressure, transforming them into metamorphic rocks.
3. Sedimentary rocks can also be buried deep within the Earth and transformed into metamorphic rocks by heat and pressure.
4. Metamorphic rocks can be melted by intense heat, forming magma.
5. Magma can cool and solidify into igneous rocks.
6. Igneous rocks can be uplifted to the Earth's surface, where they are exposed to weathering and erosion, starting the cycle anew.
The rock cycle is a continuous and dynamic process that is constantly reshaping the Earth's surface. It is driven by plate tectonics, volcanic activity, weathering, erosion, and other geological forces.
