Students write letters to organizations, such as United States Geological Society, to find out more about rocks. Students write about a pretend time they found a magic pebble. Students calculate distances to travel to see various...

Fourth graders make models of igneous, metamorphic, and sedimentary rocks out of different types of candy and cookies.

Students, after making quantitative and qualitative observations of their rocks, construct a Venn diagram or dichotomous key to classify their rocks.

Students discuss the differences between the three types of rocks and how radon can escape from the rocks themselves. They analyze other sources of radon in the environment. They work together to complete an activity and worksheet.