Research topic:earth (geology)

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earth

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

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 clays, e.g., fuller's earth , and to other compounds, e.g., carbonates, silicates, or hydroxides. Many earths were once thought to be elements . A. L. Lavoisier was first to suspect that they might be compounds of more basic elements. Earth was one of the four "roots" of the Greek philosopher Empedocles, the other three being air, water, and fire. These substances were first called elements ( stoicheia ) by Plato.

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Book article from: World of Earth Science ...which focuses on the chemical, physical, and biological history of Earth, or physical geology, which is the study of Earth materials and processes. Historical geology uses theory, observation, and facts derived from studying rocks and fossils...
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Book article from: The Oxford Companion to the Earth ...approximately 360 million km 2 ) of the Earth's surface. Marine geology is the study of the nature and history of the earth beneath the sea. The origins of marine geology lie in the development of submarine...

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