respiration
The Process of Photosynthesis that plant use to produce energy food is responsible for a lot of oxygen being freed into the atmosphere.
Evaporation from the ocean
photosynthesis
Yes. There is one planet with oxygen in its atmosphere: our home planet Earth.
The two major components of the earth's atmosphere are nitrogen and oxygen. There is also trace amounts of hydrogen, carbon dioxide, and other gases.
The process that produces most of the oxygen in Earths atmosphere is photosynthesis. Plants use this process to create food.
photosynthesis
Trees and plants, in the process of photosynthesis, are continually replenishing oxygen into the air.
The Process of Photosynthesis that plant use to produce energy food is responsible for a lot of oxygen being freed into the atmosphere.
Evaporation from the ocean
the atmosphere forms a protective boundary between earth and space and provides conditions that are suitable for life
Oxygen or O2Oxygen is produced by the process of photosynthesis.
photosynthesis
Yes. There is one planet with oxygen in its atmosphere: our home planet Earth.
The oxygen in Earth's atmosphere has been generated, over geological time, by the plant life on Earth.
It doesn't; Earth has many other gasses. Our atmosphere is mostly nitrogen; only about 21% is oxygen. It may be that you intended to ask, why does only Earth have free oxygen in its atmosphere, while other planets in the solar system don't. Free oxygen is produced by green plants (by a process called photosynthesis) and green plants grow only on Earth.
Cyanobacteria do not require oxygen. They are believed to have produced the first oxygen supply in the Earth's atmosphere, through the process of photosynthesis.