Earth is a planet in the milky way galaxy and has a radius of 3,959 mi. It is a life filled planet whose primary inhabitant is the human. The name Earth translates from a dead human language called "Latin" to dirt. Earth consists primarily of water, 70% of earth is water in fact. some notable animals that inhabit Earth are Anteaters, Mosquitoes, Tapir, and Lemmings. Earth's atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor. In addition, Earth's atmosphere contains traces of dust particles, pollen, plant grains and other solid particles, Make sure you can breathe it!