This collection of activities from the Ohio Geological Survey features a variety of activities for younger students. These activities use common materials to illustrate geologic topics such as crystal growth, plate tectonics, fossilization, rocks and minerals, and others. There are also games and puzzles, models of the Earth-Moon system and the Sun, and activities on geologic time, Ohio geology, soil liquefaction, and others. Educational levels: High school, Intermediate elementary, Middle school