1. Detrital Sedimentary Rocks:
Diagram:
[Image: A diagram showing a mountain range with weathering and erosion occurring. Rocks break down into smaller pieces, which are transported by wind and water. These sediments are deposited in a basin and eventually lithified to form sedimentary rock.]
Explanation:
* Weathering & Erosion: Rocks at the Earth's surface are broken down by weathering (physical and chemical processes) into smaller pieces called sediments.
* Transportation: These sediments are then transported by wind, water, or ice.
* Deposition: The sediments eventually settle and accumulate in a basin (e.g., lake, ocean, river delta).
* Lithification: Over time, the sediments are compacted and cemented together by dissolved minerals, forming a solid rock.
Example: Sandstone (formed from sand grains)
2. Chemical Sedimentary Rocks:
Diagram:
[Image: A diagram showing dissolved minerals in water. These minerals precipitate out as the water evaporates, forming a layer of solid minerals. Over time, these layers accumulate and lithify to form sedimentary rock.]
Explanation:
* Dissolution: Minerals dissolve in water, creating a saturated solution.
* Precipitation: When conditions change (e.g., evaporation, temperature change), the dissolved minerals precipitate out of solution, forming solid crystals.
* Accumulation: These crystals settle and accumulate in layers.
* Lithification: The layers are compacted and cemented together, forming a solid rock.
Example: Rock salt (formed from the evaporation of seawater)
3. Organic Sedimentary Rocks:
Diagram:
[Image: A diagram showing a swamp or bog where plant matter accumulates. Over time, the plant matter is buried and compressed, eventually transforming into coal.]
Explanation:
* Accumulation: Organic matter (e.g., plant debris, animal remains) accumulates in a specific environment.
* Burial & Compaction: The organic matter is buried under layers of sediment, creating pressure and heat.
* Transformation: The organic matter undergoes chemical and physical changes, transforming into a different substance (e.g., coal, oil shale).
Example: Coal (formed from the accumulation and transformation of plant matter)
