An ocean basin is a large, underwater depression that holds the world's oceans. These basins are formed by tectonic processes, where the Earth's crust moves and shifts. They can vary in size and depth, with some areas being very deep, like the Mariana Trench, while others are shallower. The ocean basins are essential for marine life, as they provide habitats and influence ocean currents. The structure of an ocean basin includes features like continental shelves, slopes, and abyssal plains. The Atlantic Ocean, Pacific Ocean, and Indian Ocean are examples of major ocean basins. Understanding these basins helps scientists study climate patterns, marine ecosystems, and geological processes.