Study Guide Physical Geology Exam 3 1. Understand continental margins and their parts, including canyons and how they form. 2. Very generally, be able to discuss beach erosion; how it occurs and how to prevent it. 3. Understand the parts of a wave and how waves form and break. Be able to discuss the ways that waves interact with sediment. 4. Be able to discuss tides, including the types and how they form. 5. Be able to describe how a glacier forms, moves and erodes. Understand how the Earth’s position can influence ice ages. 6. Understand how groundwater is stored, how it flows and how it is collected for use. 7. Have a general knowledge of the various depositional environments and some of the ways that they can be identified.