The lesson plan discusses the different types of rocks and how they are formed. It introduces igneous, sedimentary, and metamorphic rocks. Igneous rocks form when molten rock material hardens either on the surface or within the earth's crust. Sedimentary rocks form through the weathering and deposition of debris over time. Metamorphic rocks form from changes to existing rocks through high temperatures and pressures. The lesson uses presentations and activities to help students understand how rocks form and classify different rock types based on their mode of formation.