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not made or changed by humans natural
to wear down, polish, or sharpen by friction grind
to fade away as if by breaking up or melting dissolve
to bend or throw back waves of light reflect
a quartz that is transparent or nearly so crystals
the action of a force against an opposing force pressure
the portion of the earth lying between the crust and the core mantle
an element found in all living things. carbon
a solid chemical element or compound that occurs naturally in the form of crystals and results from processes not involving living or once-living matter mineral
Created by: renee.thomas