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earth

(Encyclopedia) earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths , rare earths , and alumina . The name is also applied to certain absorbent ...

Earth (Planet)

(Encyclopedia) earth, in geology and astronomy, 3rd planet of the solar system and the 5th largest, the only planet definitely known to support life. Gravitational forces have molded the earth, like all celes...

Earth

  + PLANET EARTH HOW WAS EARTH FORMED? IS EARTH THE SAME ALL THE WAY THROUGH? HOW DOES EARTH SUPPORT LIFE? HOW DOES EARTH MOVE THROUGH SPACE? SEASONS FIND OUT MORE …

Earth Day

(Encyclopedia) Earth Day, Apr. 22, a day to celebrate the environment. The first Earth Day was organized in 1970 to promote the ideas of ecology, encourage respect for life on earth, and highlight growing con...

rare earths

(Encyclopedia) rare earths, in chemistry, oxides of the rare-earth metals . They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, al...

earth pig

(Encyclopedia) earth pig: see aardvark .

earth goddess

(Encyclopedia) earth goddess: see Great Mother Goddess .