Physical Agent Inventory: Earth

Last modified: Wed 4/16/97 1615 PDT

Canon Terms	Object	Classes	(none)
		Instances	Earth
	Event	Classes	(none)
		Instances	(none)

Earth is the solar planet third-closest to Sol between Venus and Mars.

• You can learn about Earth here:
• Earth Introduction (Calvin J. Hamilton)
• Welcome to Earth's Solar Environment (UCSD ISPEC)
• Earth (Space Physics Textbook of Oulu (Finland))
• Earth and Moon Viewer (John Walker)

Earth is considered to consist of its geosphere, its hydrosphere and its atmosphere. It supports the Earth biosphere.

Earth history is the behavioral trajectory of the Earth, a complex event covering a span of time reaching back to some 4.6 billion years in the past.