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mascon

 
   
A concentration of mass below the Moon\'s surface, first detected by spacecraft in lunar orbit whose motion was more irregular than expected for a uniform gravitational attraction. Mascons occur beneath lunar maria, and probably originated when ancient impacts removed lighter surface rock, and denser rock from the mantle bulged upwards.  

 

 

 
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Other Terms : boric acid (boracic acid) | phosphorus | ammine complex

 

 

 
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