What is Earth?
Earth is a planet (also known as Terra) orbiting the
star called Sol, or the Sun. It is smaller than many, with
a rocky crust and an atmosphere of nitrogen, oxygen, and other
trace gases. It has water in all three phases, and associated
thermal and tidal activity. It has a magnetic field due to its iron
core, and a charged-particle tail that extends along its orbital
path. An incredible diversity of carbon-cycle organisms exist on
its surface and in its oceans. The Earth has one natural satellite,
the Moon, and numerous artificial contructs on the surface and in
space, notably by the primate species, Man (homo sapiens).
Earth is the only known location of carbon-cycle life within the
solar system. The utilization of its resources by Mankind is
subject to the continuing balance of the ecosystem, and energy
supplied by the Sun and terrestrial sources.
Earth is the planet we live on.