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Geology
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Unconformity
Unconformity is the superimposing of strata with different ...
Undermining
Undermining is the hollowing action of flowing water (sea ...
Undulated green slate
Undulated green slate is a metamorphic stone of sedimentary ...
Uniaxial
Uniaxial is a term describing a crystal that has an index ...
Unit cell
A unit cell is the smallest volume conserving the ...
Useful substances
Useful substances are rocks or minerals used for their ...