..Calcareous ..Chlorite ..Contact metamorphism
..Calcic horizon ..Cinder ..Continental collision
..Calcite ..Cinder cone ..Continental crust
..Caldera ..Clast ..Continental drift
..Carbonate ..Clastic ..Cordilleran ice sheet
..Carbonic acid ..Clay ..Convergent plate boundary
..Cave Cave system ..Cleavage ..Core
..Cavernous weathering ..Cobble ..Crater
..Cementation Cenozoic Era ..Compaction ..Craton
..Chemical sedimentary rock ..Composite volcano ..Crust
..Chemical weathering ..Conformable ..Crystallization
..Chert ..Conglomerate


Information provided by: http://geology.wr.usgs.gov