It is produced by the photosynthesis of plant life.
Oxygen when came in contact with UV broke down. It then reacted with more oxygen to form ozone.
No its not. Ozone is a form of oxygen.
There is oxygen in the atmosphere of Saturn, but it is only a tiny fraction of the deep atmosphere, which is mostly hydrogen. It is not in a usable form as is oxygen on Earth.
Ozone is an important form of oxygen. It forms a miracle layer in atmosphere.
The oxygen molecule, the form of oxygen found in the Earth's atmosphere, is 100% oxygen. There fore it is the material that has the most oxygen in it.
Oxygen. Carbon burns to form carbon dioxide, incomplete combustion with insifficient oxygen will produce carbon monoxide.
oxygen, nitrogen, hydrogen, and carbon dioxyde
very high temperature is needed to combine hydrogen and oxygen. at that temperature, water exists in gaseous form Oxygen exists as a gas in our atmosphere, because there isn't very much hydrogen in the atmosphere. If the Earth's atmosphere contained a substantial amount of hydrogen mixed with the oxygen, it would be an explosive mixture. Any spark would set it off. They the oxygen and hydrogen would combine to form water, and we would be left without enough oxygen to breathe.
Ozone is the type of oxygen which protects us from the harmful solar radiations. It is the triatomic form of oxygen.
The correct form is "Did he come today?" The auxiliary verb "did" is followed by the base form of the main verb "come" in questions in the past simple tense.
Algae activity
Interesting question. The Oxygen must come from somewhere. On Earth a plant gets oxygen from 2 sources. Water and/or the atmosphere. It does not just make it up, simply transforms it from one form to another. A plant takes in Carbon Dioxide (CO2) and releases the Oxygen (O2) into the atmosphere. If there were some form of atmosphere/light/water to sustain the plants life then they will automatically produce a more oxygen rich atmosphere. As for the moon: It doesn't really have enough gravitational pull to sustain an atmosphere like that. Maybe Mars where the Atmosphere is 95% Carbon Dioxide and quite possibly large frozen lakes of ice.