Appeal to students' multimedia leanings by assigning them a rock formations video assignment, to be created in groups of three of four. Assign a type of rock, igneous, metamorphic or sedimentary, to each group. Have each group research the processes rock cycles through to obtain information that the students will use to write a skit. For students who are not technology-savvy, have a volunteer film their skit in class. More advanced students can create their own video and bring it to class.
Closely examining sand can be a good way for sixth graders to grasp the basic principles of rock formation. Break students into groups, giving each group a cup of sand; a sheet with rock samples; magnifying lenses; and toothpicks. Have the students sort the sand into piles based on grain color, texture, luster, shape, chemical reaction or other identifying attributes. Have them compare their piles to provided rock samples, and ask them to try and identify each type of sand. They should be able to justify their choices, either in writing or as an oral presentation.
After studying the rock cycles of the major rock groups, give each child a large piece of poster paper, a pencil and thin markers. Ask each child to create a poster of a chosen group, showing the cycle and providing basic information. Encourage them to use pictures, arrows and words to express their understanding.
Once you have taught lessons on igneous, metamorphic and sedimentary rock formations, invite students to participate in a crayon rock cycle activity. Provide students with sample rocks or pictures of each rock. Using crayons, ask your students to create an example of each type of rock. They will create the rocks by shaving the crayons, applying pressure to the crayons or exposing the crayons to heat. Each action simulates a different rock cycle, and will create a different result.