at lest 99.9%
Oxygen formed on earth by compound of nuclear fission of sun with helium and hydrogen.
The earth formed and let of carbon, oxygen, and other gases. Those gases collected and formed the atmosphere. When the Earth cooled, some hydrogen and oxygen bonded to make water vapor. Soon we had lakes, then oceans, and then life.
The OZONE LAYER becuase is made of oxygen that why
Ozone
O2 molecule / a non polar covalent compound is formed
Oxygen
earth gases are that naturaly formed on earth eg. oxygen and the one in are gas boilers that people pump out of the ground is methane.
Oxygen is not formed in nature, but rather it is produced through processes such as photosynthesis by plants and cyanobacteria. These organisms use sunlight to convert carbon dioxide into oxygen as a byproduct. Oxygen can also be released through chemical reactions in the Earth's atmosphere.
The major product of Carbon burning in Oxygen is Carbon Dioxide (CO2), but some Carbon Monoxide (CO) can be formed depending how much Oxygen is present.
Ozone is a tri oxygen molecule. It is formed in a natural process by the action of UV light on oxygen molecule.
Oxygen
It is the Universe that expanded, not specifically the Earth. Earth was formed much later than the Big Bang. The Universe continues expanding, though.It is the Universe that expanded, not specifically the Earth. Earth was formed much later than the Big Bang. The Universe continues expanding, though.It is the Universe that expanded, not specifically the Earth. Earth was formed much later than the Big Bang. The Universe continues expanding, though.It is the Universe that expanded, not specifically the Earth. Earth was formed much later than the Big Bang. The Universe continues expanding, though.