The topic examines the how ridges and trenches underneath the ocean are formed and how they modify the seafloor.

Lesson Outcomes

• At the end of this lesson, the student will be able to:
• Explain that ridges are formed due to the movement of tectonic plates
• Describe the process of subduction and how it contributes to the formation of trenches
• Explain that the creation of ridges generates new seafloor, and the creation of trenches destroys seafloor