The Rock Cycle: A hands on Simulation
In this lesson the students will simulate the rock cycle by manipulating wax crayons to represent different forms of rocks. Students will learn the vocabulary of rocks and the formation of the rock cycle.
Context for Use
Resource Type: Activities:Lab Activity
Grade Level: Intermediate (3-5)
Description and Teaching Materials
To gain an idea of how the rock cycle works, the world rock tour that began in Hawaii might end in east Greenland. Millions of years ago there, magma deep inside the Earth forced its way into another rock and solidified. This created an igneous rock. Then, intense pressure in the Earth caused the rock to up-heave, fold, and crumple, until it became an entirely new rock: a metamorphic rock. That new rock now makes up a mountain formation in Greenland.
And the rock cycle continues today. Everyday, little pieces of the mountain rock are worn away by water and wind. Those pieces collect somewhere and are compressed into new sedimentary rocks, which will continue to change and reenter the cycle as different metamorphic rocks or as melted material that can form new igneous rock. Then the process will begin all over again.
Igneous rocks are created when molten material such as magma (within the Earth) or lava (on the surface) cools and hardens. The hot material crystallizes into different minerals. The properties and sizes of the various crystals depend on the magma's composition and its rate of cooling. Examples of Igneous rocks: Granite, Obsidian, Basalt, Pumice, Andesite, Diorite, and Rhyolite
Sedimentary rocks are made up of sediments eroded from igneous, metamorphic, other sedimentary rocks, and even the remains of dead plants and animals. These materials are deposited in layers, or strata, and then are squeezed and compressed into rock. Most fossils are found in sedimentary rocks. Examples of Sedimentary rocks: Sandstone, Shale, Conglomerate, Limestone, Chert, Coal, and Gypsum
Metamorphic rocks are produced when sedimentary or igneous rocks are transformed by heat and/or pressure. The word "metamorphic" comes from the Greek language, which means "to change form." Examples of Metamorphic rocks: Marble, Slate, Quartzite, Schist, and Gneiss
Have students use wax crayons, which will be taken apart and put back together for a simulation of the entire rock cycle.
The whole crayon represents an Igneous rock. To show Weathering: shave the crayons. Then Erosion occurs so pick up the crayon shavings and move them. The shavings (rock pieces) stop moving in various places this is called Deposition. One place rock pieces can be deposited is underground where compaction occurs. To show this put the crayon shavings onto some aluminum foil and fold into a packet.
Compaction forms Sedimentary Rocks: put packet between your hands and apply light pressure. Add heat and pressure to form Metamorphic Rocks: put packet between your hands and apply heavy pressure.
Melting and cooling brings us back to the form of an Igneous Rocks: melt the compressed crayon shavings. You can do this by placing the foil packet on an electric griddle. You can then pour the melted crayon over ice cubes to form "pumice," or into ice water to form "obsidian," or over warm or hot water to form an Igneous rocks, such as "diorite" and granite."
I would then have students go back to the rock cycle diagram in their notebooks and add any new learning. I would have them use their vocabulary sheets and glue them into their notebook matching the correct definition to each word.
vocabulary sheet for the rock cycle (Acrobat (PDF) 7kB Aug3 09)
Teaching Notes and Tips
220.127.116.11.1 - Earth structure and its formation