1. What is the relations perature and density? 2. What happens to seawate alinity increases? 3, Describe the three temperature layers in a mid-latitude ocean region. How do these layers contribute to vertical density structure? 4. What is the pycnocline, and how does it act as a barrier to mixing in the ocean? 5, Why is overturning more common in polar regions than in temperate areas? 6, Explain how thermohaline circulation is initiated in the North Atlantic. What roles do ' temperature and salinity play in this process? 7. How does the density structure of seawater change between summer and winter in a temperate region? Illustrate your answer. 8. How does global warming affect the stratification of the ocean and its impact on thermohaline circulation? What might be the broader implications of these changes on climate