1. 3.3 – Sedimentary Rocks

2. Videos/Websites
=relmfu

3. Do Now
What is compaction?

4. Do Now What is compaction?
The process by which sediments are squeezed together by the weight of overlying materials driving out water.

5. Sediments
Angular
Key Words

6. Vocab Words Erosion Deposition Compaction Cementation
Chemical Sedimentary Rock
Clastic Sedimentary Rock
Vocab Words

7. Sedimentary Rocks
Sedimentary rocks form when solids settle out of a fluid such as water or air.
The rocks will eventually become cemented to form sedimentary rocks.
Clastic vs. Chemical

8. Formation Weathering Erosion Deposition
Weathering is any process that breaks rocks into sediments.
This is the first step in the formation of sedimentary rocks
Erosion
Involves weathering and the removal of rock.
Agents of erosion – water, wind, ice, or gravity
Deposition
When an agent of erosion loses energy, it drops the sediments.
Sediments are dropped according to size, the larger ones will deposit first, and the smaller ones last.

9. Formation Compaction Cementation
A process that squeezes, or compacts, sediments.
Caused by the weight of sediments.
Much of the water in the sediments is driven out.
Cementation
Takes place when dissolved minerals are deposited in the tiny spaces among sediments.
Sometimes the cement holding the rocks together are easily seen, other times it is microscopic.

10. Classification of Sedimentary Rocks
Classified by the way they form.
Clastic Sedimentary Rocks – rocks made of weathered bits of rocks and minerals.
Chemical Sedimentary Rocks – rocks formed when dissolved minerals precipitate from water solutions.

11. Clastic Sedimentary Rocks
Many different minerals are found in clastic rocks.
Most common are clay and quartz.
Can be grouped according to the size of the sediments in the rocks.
When rounded, gravel-size or larger particles make up most of the rock, the rock is called Conglomerate.
If the particles are angular, the rock is called Breccia.
Sandstone is the name given to rocks when the sediments are sand-size grains.
Shale, the most common sedimentary rock, is made of very fine-grained sediments.
Siltstone is another fine-grained rock.

12. Clastic Sedimentary Rocks

13. Chemical Sedimentary Rocks
These are the sedimentary rocks that have fossils in them.
Precipitation that generally occurs during the formation of chemical sedimentary rock is from evaporation of a solid product.
Limestones
Rock Salt
Chert
Flint
Rock Gypsum
Coquina

14. Features
The many unique features of sedimentary rocks are clues to how, when, and where the rocks formed.
Fossils are found in chemical sedimentary rocks and show us our past.

15. Classification Chart

16. Group Activity
On page 79, use that table to fill in the blanks on your group paper and place it in your folder when complete.