.Catholic AnswerNormally stone, at least the actual part of the altar that the sacrifice is celebrated on would be stone. There is often an "altar stone" inserted in the top of a wooden altar.
it is mad out of wood
The altar in the courtyard of the Tabernacle was called the Brazen Altar or the Altar of Burnt Offering. It was made of bronze and used for offering sacrifices, including burnt offerings, to God. This altar was central to the sacrificial system in ancient Israel, symbolizing atonement and worship.
An altarage is the collective offerings made upon the altar or to a church.
An altar is actually called "the altar", although if there are many altars in a Church, they may be called by a specific name, like the main altar, the high altar, the side altar, the Blessed Virgin Mary altar, the altar of repose, the Blessed Sacrament altar, the St. Joseph altar, etc.
Bowing to the altar, consecrated by a Bishop, acknowledges that Jesus is made present there; if a non Catholic attends the service he can bow as a sign of respect but does not have to if uncomfortable.
altar
It is a cloth placed on an altar.
That is a style decision made by the local parish. It has no basis in doctrine.
The hanging cloth on an altar is called an altar cloth or an altar frontal. It is used to decorate the altar and often changes according to the liturgical season or special occasions in the church.
the altar is used for prayer and sacrifice
The homophone for alter is "altar."