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.
An arthrogram is a type of X-ray in which a contrast material such as a dye, air or both is injected into a joint. Arthrography is used so that your doctor or surgeon can see the soft tissues of the joint (tendons, ligaments, muscles and cartilage) better. These things cannot be seen on a standard X-ray. An arthrogram is done to: