A rock made up of fragments of rock or pebbles, cemented together by some other material.

COROLLA. — The second envelope of a flower usually composed of coloured, leaf-like organs (petals), which may be united by their edges either in the basal part or throughout.

CORRELATION. — The normal coincidence of one phenomenon, character, etc., with another.

CORYMB. — A bunch of flowers in which those springing from the lower part of the flower stalks are supported on long stalks so as to be nearly on a level with the upper ones.

COTYLEDONS. — The first or seed-leaves of plants.

CRUSTACEANS. — A class of articulated animals, having the skin of the body