Earth is a good natured, true blue friend! Earth is home to millions of different forms of life, including bacteria, animals, plants and you humans. At present earth is the only place in the universe where any kind of life, simple or complex, is known to exist. About 71% of Earth's surface is covered with water, giving it the characteristic blue appearance from space. This presence and abundance of liquid water makes Earth unique compared to its planetary neighbors. Liquid water is a fundamental element for life to exist. When sitting, Earth measures 6" tall and is recommended for ages 3 and up.