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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.
Wiki User
∙ 9y ago
Wiki User
∙ 14y agoThere 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.
Wiki User
∙ 11y agooxygen, 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
Wiki User
∙ 15y agoOxygen.
Wiki User
∙ 13y agooxygen
Wiki User
∙ 12y agoOxygen.
Wiki User
∙ 13y agonitrogen
Wiki User
∙ 13y agooxygen...
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What gases were present in earths today atmosphere?
Nitrogen
Which gases made up most of Earths early atmosphere?
mostly carbon dioxide with little or no oxygen.
What gases were probably abundant in the earths early atmosphere?
on ancient Earth, nitrogen, water vapor, carbon dioxide, and methane were probably the most abundant gases in the atmosphere.
What Gases in earths atmosphere exert what on everything?
Pressure
Why does the atmosphere have layers?
because they are made up of gases and the gases protect the earths life forms.
What gases were present in earths today atmosphere?
Nitrogen
When earths early atmosphere formed which gases where lost because earths gravity was too weak?
Hydrogen and helium
What factor contributed to the formation of earths early atmosphere?
energy from the sun,lightening,earths heat triggered chemical reaction for the early gases of the earth combined
Which of the following gases was NOT present in Earth's early atmosphere?
Hoyaaa
Which gases made up most of Earths early atmosphere?
mostly carbon dioxide with little or no oxygen.
What Active volcanoes are added to the early Earths atmosphere?
There are smallamount of volcanoes. They emit so2 and co2 gases.
What do some of the gases in the earths atmosphere absorb?
Ozone gas is present as ozone layer. It absorbs the UV rays of the sun.
What gases were probably abundant in the earths early atmosphere?
on ancient Earth, nitrogen, water vapor, carbon dioxide, and methane were probably the most abundant gases in the atmosphere.
Where do these main gases come from?
they come from earths atmosphere and gases
What is the makeup of earths atmosphere?
Gases
What are trace 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.
Which gases were parts of earths original atmosphere?
HIDROGEN
