s Essential Question What forces have shaped, and continue to shape, the Grand Canyon landscape? Guiding Questions How do these forces continue to shape the Grand Canyon landscape? Why is the Grand Canyon here and nowhere else? Objectives Students will identify natural processes (river, weathering, and erosion) and human activities that contribute to changes at Grand Canyon. Students will apply cause and effect relationships to explain how and why the Grand Canyon's landscape is changing. Students will learn how the Colorado River has shaped the Grand Canyon over millions of years. Education S Duration: 45 minutes.