1. Marine Geology & Plate Tectonics | Layers of the Earth, types of plate boundaries, volcano formation, tsunamis, and their effects on marine ecosystems. 2. Marine Ecology & Food Chains | Definitions of community, habitat, population; trophic levels; factors affecting population growth in sharks. 3. Oceanic Chemistry & Oxygen Dynamics | Oxygen levels in ocean zones, CO₂ concentration variations, impact of photosynthesis and respiration on marine gases. 4. Marine Organisms & Adaptations | Cell structures in plant and dinoflagellate cells, seagrass anatomy, adaptations of deep-sea fish. 5. Human Impact on Marine Ecosystems | Oil extraction and mangrove forest conservation, effects of climate change on estuaries, plastic pollution in oceans. 6. Physical Oceanography | Water cycle variations between polar and tropical regions, nutrient transport, plastic waste calculations. 7. Climatic Events & Ocean Currents | El Niño formation, global impacts, and wind-driven oceanic changes. 8. Marine Migration & Fisheries | Bluefin tuna migration, differences between seas and oceans, conservation concerns.