The sea covers about 71% of the Earth's surface and is home to diverse ecosystems, including coral reefs and deep-sea habitats. It plays a crucial role in regulating the planet's climate and supports a wide range of marine life, from tiny plankton to large whales. Earth is the third planet from the Sun and the only known planet to support life. It has a variety of environments, including mountains, forests, and deserts. Beyond Earth lies space, a vast expanse filled with stars, planets, and galaxies, where phenomena like black holes and supernovae occur.