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            | Topic: | 
            
                
                    Science
                
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            | Number of pages / Number of words: | 
            
                10 / 2630             | 
        
                
    
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In helium-burning stars the isotope of carbon
with mass 12 is thought to capture an alpha particle to form the isotope with
mass 16 with the emission of a gamma ray. In the terrestrial environment oxygen
accounts for about half of the mass of the Earth's crust, 89% of the mass of the
oceans, and 23% of the mass (and 21% of the volume) of the atmosphere...
        
        
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Most of
the Earth's rocks and soils are principally silicates. The silicates are an
amazingly complex group of materials that typically consist of greater than 50
(atomic) percent oxygen in combination with silicon and one or more metallic
elements. Several important ores are principally oxides of the desired metals,
such as the important iron-bearing minerals hematite, magnetite, and limonite
and the most important aluminum-bearing mineral, BAUXITE (a mixture of hydrated
aluminum oxides and iron oxide)...
        
        
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            General points of the essay
            
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