Moons: 1 78.08% nitrogen, 20.95% oxygen basaltic rock and water oceans
Earth is the third planet from the Sun. Earth is the only planet in our solar system known to harbor life: life that is incredibly diverse. All the things we need to survive exist under a thin layer of atmosphere that separates us from the cold, airless void of space. Earth is made up of complex, interactive systems that create a constantly changing world that we are striving to understand. Earth's global ocean, which covers nearly 70 percent of the planet's surface, has an average depth of about 4 km. Near the surface, an atmosphere that consists of 78 percent nitrogen, 21 percent oxygen, and 1 percent other ingredients envelops us.