To learn why, where, and how earthquakes happen, you need to familiarize your students with the interior of the Earth and a model called plate tectonics. The engine behind the earthquake machine is ...

In this lesson students are introduced to Frederick Jackson Turner and how early Census data, when combined visually with maps, effectively demonstrated the end of the frontier. By reading Turner’s ...

The earliest scientists first observed the waves that earthquakes produce before they could accurately describe the nature of earthquakes or their fundamental causes, as discussed in Lessons 1–5.