Composition Humans live here! Earth is a terrestrial planet (rocky) with a soild and dyinamic surface of mountians, canyons, plains, and more. Most of earth is covered by water. Earth's atompshere is 78 percent nitrogen, 21 percent oxygen and 1 percent other ingredients.
Unique Characteristics Earth is the densest planet in the solar system and is the only planet in the universe that is known to support life!