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Q6: Silica is a term for oxygen combined
Q14: _ is the most common element in
Q21: The magnetic poles are displaced about _
Q28: On large alluvial fans, the _ sediment
Q31: Most caves are probably formed by ground
Q36: Dune sand throughout the world is composed
Q39: At the surface of the Earth, ultramafic
Q41: Humans can trigger earthflows by adding water
Q48: Because the crystal structure of ice is
Q52: Recently, geologists have been analyzing _ generated