Most Scuba tanks are filled with compressed air (same as the "normal" air we breath) 21% Oxygen and 79% Nitrogen. The tanks are a variety of colors and the color does not signify anything. Special NITROX tanks have a bold Yellow and Green band which goes around the tank and is usually 8" wide. NITROX can have a range of between 32% and 50% oxygen (the balance is nitrogen). This yellow/green band - with the word NITROX can be placed on any color tank. Special tanks with exotic gas mixes will be indicated with special bands - there is no standard colors for exotic mixes.
green
Because salt is Sodium Chloride and when burned reacts with oxygen to form Sodium Chloride Oxide
to musrure oxygen
To produce glucose for the plant to eat
oxygen, fuel, heat and chemical chain reaction
When it is rich with oxygen. It will become dark colour when it contain less oxygen (after the oxygen used by the body tissues )
Animals need to breathe to get oxygen. Oxygen burns the food within their bodies and releases energy for various activities.
It is part of the Respiratory Cycle of most living things on Earth.
Oxygen is not mined on the planet Earth. It is a free gas in the air. Various minerals ARE mined that contain oxygen.
purple in the body and red outside the body or in oxygen
various gasses and lack of oxygen
There are various functions of oxygen. For example, the most obvious is that it is needed for humans and other animals to survive.