1. What is bathymetry? How is it different from topography? 2. Describe how an echo sounder works? 3. Discuss the origin of the various volcanic peaks of the abyssal plains: sea mounts, table mounts, and abyssal hills? 4. list and describe the characteristics of the four main types of marine sediment. 5. What types of past environmental conditions can be inferred by studying cores of sediment? 6. Describe the origin, composition, texture, and distribution of lithogenous sediment..