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Science.
cut-away view of Earth's interior Geology.
Subdivisions
General.
Mineralogy.
Petrology.
Dynamic and Structural Geology.
Paleontology.

Sources and Links

How the Earth was Made

Newest Titles
Charles Francis RichterCharles Francis Richter co-developed a method for measuring earthquake intensity that accurately reflected earthquake strength. The Richter Scale, which was published in 1935, used a seismograph to record actual earth motion during an earthquake.
AgateAgate forms when silica in solution seeps into a cavity in lava and hardens in successive layers. Chemically it consists of silicon and oxygen, SiO2.
   
Mohole ProjectThe Mohole Project drilled a hole down to the boundary between the earth's crust and mantle. Doing so would, it was believed, provide a concrete check on theories about the age, origin, and composition of the earth.
   
PterosaursPterosaurs "flying lizards," were flying reptiles that lived during the age of dinosaurs. Some were as small as sparrows, while others were as large as an airplane. They had large brains, long tails, short necks, and long, narrow wings.
 
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This page was last updated on 02/22/2010.