Lesson 6: Sedimentary Rocks

Sedimentary rocks are formed through the process of

sedimentation.

Sedimentation is the process by which

minerals and organic particles collect and

settle together.

Over time this sediment will solidify together to form rocks.

Discovery Education Video:The Rock Cycle: Sedimentary Rocks

Sedimentary rocks are divided into three groups:

1. Clastic2. Chemical3. Organic

Discovery Education Video:Types of Sedimentary Rocks

Clastic sedimentary rocks are formed from sediment that is moved by water and then

settles when the movement stops.

These rocks will often have particles of sediment still visible.

Chemical sedimentary rocks are formed through the process of

evaporation.

When mineral-rich water evaporates, it leaves mineral deposits behind in in the form of

sedimentary rocks.

Organic sedimentary rocks are formed from the remains of living organisms.

Some of these organic materials such as coal can be used as fuel.

Common Sedimentary Rocks:Sandstone

(Clastic)

Common Sedimentary Rocks:Shale

(Clastic)

Common Sedimentary Rocks:Limestone(Chemical)

Common Sedimentary Rocks:Halite or Rock Salt

(Chemical)

Common Sedimentary Rocks:Coal

(Organic)

Common Sedimentary Rocks:Flint

(Organic)

Discovery Education Video:Rock Detectives: Igneous or Sedimentary?

Key Questions:1) How are sedimentary rocks formed?2) What are the three types of sedimentary rocks? How are each of these types of rock formed?3) Why are fossils usually found in sedimentary rock?4) How are sedimentary rocks different from igneous rocks?