A large body of salt water is called an ocean. Oceans cover about 71% of the Earth's surface and are essential for life, regulating climate and weather patterns and providing habitats for countless marine species. The five major oceans are the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. These vast bodies of water are crucial for global trade, transportation, and climate regulation. Oceans also play a vital role in the Earth's ecosystem, influencing atmospheric conditions and supporting biodiversity.