science 8a unit 2 lesson 15: earth changing
In Science 8A Unit 2 Lesson 15, students learn about how Earth is constantly changing and the different processes that drive these changes.
The lesson begins by introducing the concept of Earth's dynamic nature and the interconnectedness of different Earth systems. Students learn about the geological processes, such as tectonic plate movement, earthquakes, and volcanic eruptions, that contribute to Earth's ever-changing surface.
Next, the lesson explores the concept of weathering and erosion, which are responsible for the gradual breakdown and movement of rocks and soil. Students learn about the different types of weathering, including physical weathering (such as freeze-thaw cycles) and chemical weathering (such as acid rain).
The role of erosion in shaping Earth's surface is also discussed. Students learn about how wind, water, and ice can transport sediment from one location to another, creating landforms such as valleys, canyons, and deltas.
The lesson also introduces the concept of deposition, which occurs when eroded materials are dropped and settle in a new location. Students learn about how deposition can lead to the formation of landforms such as sand dunes, river deltas, and alluvial fans.
Finally, the lesson concludes by highlighting the importance of studying Earth's changing surface. Students learn about the various ways in which human activities can both impact and be impacted by Earth's dynamic processes. They are also introduced to the field of geology, which focuses on understanding Earth's history and predicting future changes.
Throughout the lesson, students engage in various activities and discussions to deepen their understanding and apply their knowledge of Earth's changing nature. They may analyze maps and diagrams, participate in hands-on experiments, or engage in class discussions to explore the different processes that drive Earth's changes.