1. Sedimentary Rocks

2. How sedimentary rocks are formed
A sedimentary rock is formed from pieces or sediments of rocks, plants, or animals.
The sediments are cemented together, at or near the Earth’s surface.

3. What is the process in which sedimentary rocks form?
Weathering
Erosion
Deposition
Compaction
Cementation

4. Weathering
Weathering breaks rocks into pieces through wind, water, ice, sunlight, and gravity.

5. Erosion moves sediments from one place to another.

6. Deposition drops the sediment into layers.

7. Compaction presses the layers of sediment together.

8. Cementation glues the sediments together.

9. A rock is said to be “stratified” if it has strata, or layers.

10. Types of sedimentary rock

11. Organic sedimentary rock
Forms from decayed plants and animals
Usually formed in oceans or swamps

12. Examples of Organic sedimentary rocks
Limestone (organic)
Coal

13. Clastic Sedimentary Rock
Clastic sedimentary rock is made of fragments of rocks cemented together by a mineral such as calcite or quartz.
Classified according to the size of the fragments.

14. Example of clastic sedimentary rock: Conglomerate
A rock composed of rounded fragments varying from small pebbles to large boulders in cement (such as hardened clay)

15. Example of clastic sedimentary rock: Breccia
Breccia is a rock composed of sharp fragments embedded in a fine-grained matrix (such as sand or clay)

16. Chemical Sedimentary rock
Chemical sedimentary rock forms from solutions of dissolved minerals and water.
The material crystallizes and forms the minerals that make up the rock.

17. Examples of Chemical sedimentary rock
Dolomite
Limestone (chemical)