Man-made gases such as tear-gas, chlorinated hydrocarbons and their ilk.
OXYGEN. That was made by plants, long after the Earth began.
In fact, the first oxygen appearing in the atmosphere came from bacteria about
3.5 billion years ago.
There are two important gases found in Earth's atmosphere today that was absent 3.8 billion years ago. Oxygen and Nitrogen. The Earth's atmosphere 3.8 billion years ago was composed mostly of Carbon Dioxide and Ammonia with smaller amounts of Methane and Water Vapor. Beginning around 3.5 billion years ago, bacteria formed and began converting Carbon Dioxide into Oxygen, through a process called photosynthesis, oxygenating the atmosphere. Oxygen began combining with the Ammonia forming Nitrogen around 2 billion years ago.
oxygen, earth didn't get o2 until after the seas cleared up and algae started to form, and it took millions of years until we had the 02 content that we have now
Oxygen.
oxygen
Oxygen.
nitrogen
oxygen...
Nitrogen
mostly carbon dioxide with little or no oxygen.
on ancient Earth, nitrogen, water vapor, carbon dioxide, and methane were probably the most abundant gases in the atmosphere.
Pressure
because they are made up of gases and the gases protect the earths life forms.
Nitrogen
Hydrogen and helium
energy from the sun,lightening,earths heat triggered chemical reaction for the early gases of the earth combined
Hoyaaa
mostly carbon dioxide with little or no oxygen.
There are smallamount of volcanoes. They emit so2 and co2 gases.
Ozone gas is present as ozone layer. It absorbs the UV rays of the sun.
on ancient Earth, nitrogen, water vapor, carbon dioxide, and methane were probably the most abundant gases in the atmosphere.
they come from earths atmosphere and gases
Gases
"Trace elements" are elements which are present in a sample, but in relatively very small amounts. "Trace gasses" probably means gasses which are present in a sample, but in relatively very small amounts. the gases in earths atmosphere that take up less than 1% volume.
HIDROGEN