The sea is a vast body of saltwater that covers about 71% of the Earth's surface. It is home to a diverse range of marine life, including fish, mammals, and plants. The sea plays a crucial role in regulating the planet's climate and weather patterns, as well as providing resources like food and minerals. The sea is divided into several major oceans, including the Atlantic Ocean, Pacific Ocean, and Indian Ocean. It also contains smaller bodies of water, such as seas and gulfs. Human activities, such as fishing and shipping, significantly impact the sea's ecosystems and health.