material consisting of the aggregate of minerals like those making up the Earth's crust

rock formed from consolidated clay sediments

a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals

an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone

a weathered and decomposed siliceous limestone; in powdered form it is used in polishing

a sequence of sedimentary rock strata in the geology of central and western Europe.

a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals

an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone