Themes by Topic
Illinois The Earth's Structure
12.7.70 Understand that lithospheric plates constantly move at rates of centimeters per year in response to movements in the mantle. Understand that major geological events, such as earthquakes, volcanic eruptions, and mountain building, result from these plate motions. Understand that over very longs periods of time (millions of years), old mountains wear down, but new ones arise from catastrophic volcanic and earthquake activity.
