If play is stopped and the interference was by: 1  a team official, substitute, substituted or sent off player, play restarts with a direct free kick or penalty kick. 2  an outside agent, play restarts with a dropped ball.
Oxygen is one of the basic chemical elements. In its most common form, oxygen is a colorless gas found in air. It is one of the life-sustaining elements on Earth and is needed by all animals.Oxygen is also used in many industrial, commercial, medical, and scientific applications.hen oxygen is cooled below -297Â° F (-183Â° C), it becomes a pale blue liquid that is used as a rocket fuel. Oxygen is one of the most abundant chemical elements on Earth. About one-half of the earth's crust is made up of chemical compounds containing oxygen, and a fifth of our atmosphere is oxygen gas.
The simple answer is the gas oxygen as, in normal life when most things burn they combine with the oxygen in the air in a violent way-that we call a flame.