with Sedimentary Rocks
suggested grade levels: 6-8
view Idaho achievement standards for this lesson
1. Students will learn how to use the Digital Atlas of Idaho.
2. Students will learn about how different types of rocks are formed and will do an activity involving sedimentary rocks.
Use the geology basics section of the Digital Atlas of Idaho. To get there: Click on Atlas Home, Geology, Basics, then on Diagrams. Review the diagram and click on the various links to learn about the three basic rock types and how each is formed. Review as a class:
1. The three basic kinds of rock.
2. How each of these rocks forms.
3. The Rock cycle.
Use the simple activity below to increase your understanding of sedimentary rocks:
1. Mix equal weights of sand and dry plaster of Paris. Pour it into a transparent
plastic container (such as a clear plastic soda-pop bottle) to make a layer
of about one-inch (2 cm). Now add a mixture of fine gravel and plaster. Do the
same for various mixtures of colored sand, or pebbles, all with plaster of Paris.
Throw in a seashell or two on a layer.
2. Now fill the container with water and leave it over night. The next day you will have your own sedimentary rock. The water will have caused the plaster to recrystallize and cement the whole mass together. The seashells will be present as "fossils".
These are links to access the handouts and printable materials.
Geology: Geology Topics