1. Describe the origin, composition, and distribution of biogenous sediment. 2. Describe the origin, composition, and distribution of hydrogenous sediment. 3. Describe manganese nodules, including what is currently known about how they form. 4. Describe the origin, composition, and distribution of cosmogenous sediment. 5. Why is it so rare to find a pure marine sediment type? Give some examples of mixtures of sediment. 6. What are gas hydrates, where are they found, and why are they important..