10. 
    Silica
    • (n.) Silicon dioxide, SiO/. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.
    Found op http://thinkexist.com/dictionary/meaning/silica/
    
    
11. 
    silica
    compound of the two most abundant elements in the Earth`s crust, silicon and oxygen, SiO2. The mass of the Earth`s crust is 59 percent silica, the ... [40 related articles]
    Found op http://www.britannica.com/eb/a-z/s/94
    
    
12. 
    silica
    A white or colorless mineral composed of silicon dioxide (SiO₂). It occurs commonly as quartz and sand, and in many other familiar rocks and minerals, including flint, granite, amethyst, and rock-crystal. Silica is refractory and inert, though it dissolves in hydrogen fluoride...
    Found op http://www.daviddarling.info/encyclopedia/S/silica.html
    
    
13. 
    silica
    silica or silicon dioxide,chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in several forms and is widely and abundantly distributed throughout the earth, both in the pure state and ...
    Found op http://www.infoplease.com/ce6/sci/A0845224.html
    
    
14. 
    Silica
    Silica refers to silicon dioxide (SiO2). A very common mineral that is found in many forms including quartz, opal, chert.
    Found op http://www.probertencyclopaedia.com/browse/HS.HTM
    
    
15. 
    silica
    Type: Term Pronunciation: sil′i-kă Definitions: 1. The chief constituent of sand, hence of glass. Synonyms: silicic anhydride, silicon dioxide
    Found op http://www.medilexicon.com/medicaldictionary.php?t=82110
    
    
16. 
    silica
    Silicon dioxide, SiO₂, the composition of the most common mineral group, of which the most familiar form is quartz. Other silica forms are chalcedony, chert, opal, tridymite, and cristobalite. Common sand consists largely of silica in the form of quartz
    Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0015308.html
    
    
17. 
    Silica
    A chemical combination of silicon and oxygen .
    Found op http://midju.tripod.com/glossary.html
    
    
18. 
    Silica
    Another name for silicon dioxide, the basic building block of volcanic rocks. Silica is a major constituent of most magmas and the amount of silica controls the viscosity of the magma
    Found op http://www.geonet.org.nz/volcano/glossary.html
    
    
19. 
    Silica
    A chemical combination of silicon and oxygen.
    Found op http://volcano.oregonstate.edu/education/glossary.html
    
    
20. 
    silica
    1) Cement ingredient 2) Flint is a form of it 3) Flint, e.g. 4) Glass base 5) Glass component 6) Glass ingredient 7) Glassmaker's need 8) Glassmaker's substance 9) Ingredient in ceramics 10) It's in the sand 11) Opal, essen...
    Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/silica/1
    
    

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