Geography Terms +

(geography includes mapmakers, scientists, explorers of the earth and provides a way to look at both the physical world and the people who live in various parts this globe)

The spreading of sediment.
A geographical region which has little or no vegetation and which averages less than ten inches of precipitation or rain during the year.
An invasion of the desert into non-desert regions.
earth's atmosphere
A mixture of gases surrounding the earth and such atmosphere is prevented from escaping because of the pull of gravity.

On earth, atmospheric pressure decreases with altitude and in its lowest layer, earth's atmosphere consists of nitrogen (78%) and oxygen (21%), both in molecular form (two atoms bonded together) and 1% argon.

Small quantities of other gases are important to the chemistry and physics of the earth's atmosphere, including water and carbon dioxide.

The earth's atmosphere is divided into four regions of atmosphere classified by temperature and the thermal structure of the earth's atmosphere is the result of the complex interaction of the following:

  • Electromagnetic radiation from the sun.
  • Radiation reflected from the earth's surface.
  • Molecules and atoms in the atmosphere.

1. A group of organisms and the environment in which they interact.
2. A community and its physical environment.
planetary albedo
The fraction (approximately 30 percent) of incident solar radiation that is reflected by the earth-atmosphere system and returned to space, mostly by scattering from clouds in the atmosphere.