Earth (IDU)

International Democratic Union
A view of the Earth from the Wosteaquean WTQ-83 Satellite
Population	~5,500,000,000
Density	22.9/km²

Earth, commonly known as the International Democratic Union, is a rocky planet. It completes an orbit around the sun approximately every 365.2422 calendar days (rotations about its axis); from the perspective of the North Pole on the planet, like most other celestial bodies in the star system, it orbits counterclockwise. It is spherical with a slight bulge at the equator owing to its rotation, which is slightly tilted compared to its orbital axis with respect to the sun, and it has one planetoid moon. It's axis of rotation produced seasons, as it is titled in respect to the planet's orbital plane. The planet is notable for being the only known location to harbor, at any time, life.

The planet is believed to have formed conventionally, several billion years ago, from the heavier elements in the accretion disk of the sun; the presence of these elements mean that the sun is at youngest a second-generation star. Distinct layers formed over time, as accretion slowed and the planet cooled.

The planet has a metallic core, which creates a magnetic field around the planet. This is surrounded by a mostly liquid mantle, composed of various metallic and nonmetallic elements, silicon being the most common. The outermost layer is the solid crust, or lithosphere, which is thin but encompasses the entire planet, being composed of similar but generally lighter materials than the mantle. Most of the planet's surface area is covered in liquid water oceans, with the dry parts constituting land. The atmosphere is primarily nitrogen, with a significant fraction of oxygen; most other components of the atmosphere are trace, including argon and carbon dioxide. The atmosphere can be divided into layers depending on altitude, and is thick enough to burn up the vast majority of objects which fall into it. The active tectonics and energetic atmosphere of the planet are notable, and highly influential on its topography, biosphere, etc.

Within the first billion years of the planet's history, life appeared in the oceans and began to affect the Earth's atmosphere and surface, leading to the proliferation of anaerobic and, later, aerobic organisms. Some geological evidence indicates that life may have arisen as early as 4.1 billion years ago. Since then, the combination of Earth's distance from the Sun, physical properties and geological history have allowed life to evolve and thrive. In the history of life on Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of all species that ever lived on Earth are extinct. Estimates of the number of species on Earth today vary widely; most species have not been described. Over 5 and a half billion humans live on Earth and depend on its biosphere and natural resources for their survival. Humans have developed diverse societies and cultures; politically, the world has hundreds of sovereign states.

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  Western Hemisphere

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  Eastern Hemisphere

Geography

Continents

The surface of the planet is the most complex and well-studied part of it, in particular the sections not covered by the oceans. One widely accepted way of spatially organizing the planet is by dividing it into continents, which are the largest sections of land, and oceans, which are the largest sections of water.

	Name	Total population
	Liberalia	1,320,000,000
	Neria	2,400,000,000
	Hesperida	4,500,000,000
	Caxcana	3,200,000,000

Oceans

There are four defined oceans on Earth: the Tenebric, the Olympic, the Southern, and the Northern.