By Subject By Standard Proficiency Assessments

Sedimentary Rocks

Earth Science - Middle School

Sedimentary Rocks

Presentation

Assign Google Classroom Weblink

Table Of Contents: Sedimentary Rocks

1. Formation of Sedimentary Rocks

Sedimentary rocks form in layers, or strata, that have been deposited and cemented together over millions of years.

2. Sedimentary Rock Categories

There are three categories of sedimentary rock—clastic, organic and chemical.

3. Clastic Sedimentary Rock

Clastic sedimentary rocks are made from pieces of pre-existing rocks that are transported by wind and water and deposited in a new location. Layers of sediment accumulate and become cemented together to form solid rock.

4. Clastic Sedimentary Rock Examples

Sandstone, shale and conglomerate are examples of clastic sedimentary rocks.

5. Organic Sedimentary Rock

Organic sedimentary rocks form when shell remains fossilize and become a layer of limestone on the ocean floor. A coral reef is an example of organic limestone formed from the buildup of coral skeletons.

6. Chemical Sedimentary Rock

Chemical sedimentary rocks form through precipitation or crystallization of dissolved minerals. Dissolved calcite forms fine-grained limestone that shows no fossilized remains.

7. Sedimentary Rock Uses

Limestone is primarily used for concrete and road construction. Coal is a type of organic sedimentary rock that is used as a solid fuel to produce electricity and heat.

Sedimentary Rocks

Earth Science - Middle School