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The Ordovician Period

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Q: What period did the formation of the oxygen atmosphere occur?
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Scientists can determine if oxygen existed in earths Archean atmosphere by?

The Archean atmosphere is believed to have been free of free oxygen. Banded iron formations did not occur till near the end of the Archean period.


When did the formation of the ozone layer occur?

Ozone formation is a natural process. It is a chemical process. When oxygen is treated with UV radiations oxygen gets converted into ozone.


Why does oxygen occur naturally?

It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.


How does oxygen occur?

If you mean how does it come to be in the atmosphere, oxygen is released into the atmosphere by plants, mostly by phytoplankton in the ocean. I you mean how is oxygen created in the first place, it is the result of lighter elements being fused together in the cores of stars.


Which of the following choices describes an oxygen deficient atmosphere?

An oxygen deficient atmosphere is one that lacks a sufficient amount of oxygen to support human or animal life. It can occur in environments where oxygen is depleted, such as in confined spaces or areas with high levels of carbon dioxide, gases, or chemicals that displace oxygen. Breathing in an oxygen deficient atmosphere can lead to suffocation or loss of consciousness.


Changes in the earth's atmosphere over a short period of time are referred to as?

Changes in the earth's atmosphere over a short period of time are referred to as climate change. These changes can occur naturally or because of humans.


Is it true or false does the increased amounts of oxygen in the atmosphere may be causing global warming to occur at a faster than usual rate?

If your question is really about oxygen then it is false. And oxygen is not increasing in the atmosphere. If you are talking about carbon dioxide, a gas that IS increasing in the atmosphere, then it is true. Carbon dioxide is causing the speeding up of global warming.


Why does cloud formation occur higher up?

Because clouds occur when water condenses from water vapour to tiny water droplets. Water condenses when it is cold enough, and higher up in the atmosphere, it is colder.


Which chemicals occur naturally in the air?

I wouldn't say that many chemicals occur naturally in the air, however Oxygen and Nitrogen are the two main gases that make up the Earth's atmosphere.


Which of the geologic events can occur at a transform boundary earthquake mountain formation volcanic eruption or rift formation?

Earthquakes occur at that moment


What time of day do tornadoes usually occur and why?

Although they can occur at any time of day, tornadoes are most common in the late afternoon and early evening. This is when the lower atmosphere is usually the warmest and thus the atmosphere is usually the most unstable. These conditions are conducive for the formation of strong thunderstorms which, given a few other conditions, can produce tornadoes.


Where does blood formation occur in adults?

bones