Atmosphere:

Geology:

Atmosphere is composed primarily of nitrogen, oxygen and argon.  Planetary tilt in relation to celestial equator results in climactic shift as the planet orbits its star.  In simpler terms:  the majority of the planet displays a seasonal, or cyclatory, climate system.

Polar ice caps are the result of indirect solar radiation.  Opposed to this are the equatorial regions which receive a relatively constant amount of sunlight.

The planet's rotation, magnetic field, and satellite influence the movement of unequally heated air masses across the surface of the planet resulting in atmospheric turbulence in the form of cyclonic storms of varying intensity.

Carbon-based animal life requires oxygen for metabolic and other life processes and produces carbon dioxide as waste.  Green plants use carbon dioxide in photosynthesis and produce oxygen.

Planetary climate features long-term periods of warming and cooling.  The exact mechanism of this phenomenon is not known.  During Modern Epoch A great expanse of time.  Here used to describe the distinct cycles of life that tend to recur on life-supporting planets.  A world in its Third Epoch, for example, would have seen two prior cycles of life followed by massive, world-wide extinction events. , this is blamed on Human intervention.

Local climate can vary greatly between differing areas of planet surface.  Desert areas featuring almost zero yearly precipitation may be found in the same latitudes as rainforests and other wetlands.

A breakdown of planetary climate by region may be found amongst numerous network resources.

Rock crust over high-temperature mantle surrounding iron core.

Convection of mantle results in continental drift, changing the face of the planet over long periods of time.

Approximately 70% of the planetary surface is under water.

Dry surface features seven continents.

A more detailed analysis of geologic and geographical featurs of Earth may be found amongst numerous network resources.

Flora:

Fauna:

Plant life is highly heterogenous.  From single-celled plant-like protozoa to massive trees, the flora of planet Earth shows remarkable adaptability and may be found thriving in all but the harshest of conditions.

There exist numerous network resources more suited to the task of classifying and defining the flora of the Modern Epoch A great expanse of time.  Here used to describe the distinct cycles of life that tend to recur on life-supporting planets.  A world in its Third Epoch, for example, would have seen two prior cycles of life followed by massive, world-wide extinction events. of Earth.

The animal kingdom may be divided in various ways.  Creatures with or without a central nervous system, for instance.  Separating the endothermic from the exothermic or into the scientific clade system are also acceptible.  A large number of Humans differentiate primarily between domestic (tamed) animals and their wild counterparts.

The potentially infinite (as new species are discovered regularly) variety of Earthly animal life defies attempts at summing up in a brief section.  Additionally, the familiarity of most Earthly animal species would make such an attempt redundant at best.

Numerous network resources exist detailing the various animal species of Modern Earth.

Technology:

Government: National

Space Age

Varied