Cavity and solid walls. 1  A cavity wall is made up of two walls with a gap in between, known as the cavity; the outer leaf is usually made of brick, and the inner layer of brick or concrete block.  A solid wall has no cavity; each wall is a single solid wall, usually made of brick or stone.
A cladogram (from Greek clados branch and gramma character) is a diagram used in cladistics which shows relations among organisms.
A urogram is a radiograph, or X-ray image, of the urinary tract, and the process of making one is known as urography. It is used in diagnostic testing for various conditions related to the urinary tract and is also used to follow up on treatment for conditions like kidney stones and cancers of the urinary tract.