Geographical Processes

Biosphere - The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life.

(biosphere. (n.d.). The American Heritage® Dictionary of the English Language, Fourth Edition. Retrieved October 24, 2007, from Dictionary.com website)

Hydrosphere - the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere.

(hydrosphere. (n.d.). Dictionary.com Unabridged (v 1.1). Retrieved October 24, 2007, from Dictionary.com website: http://dictionary.reference.com/browse/hydrosphere)

Lithosphere - The outer layer of the Earth, comprising the crust and the upper part of the mantle. The lithosphere is about sixty miles thick.

(lithosphere. (n.d.). The American Heritage® New Dictionary of Cultural Literacy, Third Edition. Retrieved October 24, 2007, from Dictionary.com website: http://dictionary.reference.com/browse/lithosphere)

Atmosphere - the gaseous envelope surrounding the earth; the air.

(atmosphere. (n.d.). Dictionary.com Unabridged (v 1.1). Retrieved October 24, 2007, from Dictionary.com website: http://dictionary.reference.com/browse/atmosphere)

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