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#geological layer #strata #earth layer #rock layer #couche géologique

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#moon shell #outer layer #lunar mantle boundary #geological layer #moon structure #crust definition

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#stratigraphy #geological layer #ash layer #rock layer #earth layers #volcanic deposit #tephra deposit

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#rock stratum #geological layer #rock exposure #mineral vein #earth science #surface geology

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#stratum #interbedded #layer insertion #geological layer #rock layers