海洋 refers to the vast bodies of saltwater that cover about 71% of the Earth's surface. It plays a crucial role in regulating the planet's climate and weather patterns. The major oceans include the 太平洋 (Pacific Ocean), 大西洋 (Atlantic Ocean), and 印度洋 (Indian Ocean), each with unique ecosystems and marine life. The 海洋 is home to a diverse range of organisms, from tiny plankton to the largest animal on Earth, the 蓝鲸 (blue whale). It provides essential resources, such as fish and minerals, and supports global trade through shipping routes. Additionally, the ocean is vital for recreational activities and tourism.