pages matching 'planet-earth'
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The Triassic is the first period of the Mesozoic era of geologic time. It extends from 251 to 200 million years ago. The Triassic period is preceded by the Permian ...
updated 2010-07-18 01:03:06
Peak Water is reached when the demand for water is higher than the capability to replenish the supply. There is concern that the state of peak water is being approached ...
updated 2010-07-17 18:26:57
Scientific classification, also called biological classification or taxonomy, is the system of organization and nomenclature used to define all life.The Free Dictionary: Taxonomy