Consider the following statements: 1. I. Tides are of great help in navigation and fishing. 2. II. High tide enables big ships to enter or leave the harbour safely. 3. III. Tide prevents siltation in the harbours. 4. IV. Kandla and Diamond Harbour are tidal ports. Which of these statements are correct?

Evaluating the statements about tides: 1. Statement I: Tides (the rise and fall of sea levels) create tidal currents. These currents can assist ships entering and leaving harbours (navigation) and influence the movement of fish, aiding fishing activities. (Correct) 2. Statement II: High tide increases the depth of water in harbours and estuaries, allowing larger ships to enter or leave the harbour safely, clearing shallow areas. (Correct) 3. Statement III: The regular inflow and outflow of tidal water can help to scour channels and remove accumulated silt, thus preventing or reducing siltation in harbours. (Correct) 4. Statement IV: Kandla (Deendayal Port) in Gujarat and Diamond Harbour in West Bengal are known examples of tidal ports in India, where port operations are significantly influenced by tides. (Correct) Since all four statements are correct, the answer includes I, II, III, and IV.