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Has the percentage of atmospheric oxygen decreased over time?
Timtenn
Yes, scientists state that the atmosphre is decreasing in parts. Not the whole but some specific parts. The man-made global warming gases like co2 are lessing the atmosphere parcially by centimeters.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoThere is less oxygen in the atmosphere now than there was in the carboniferous, about 350 million years ago.
Oxygen levels have remained fairly constant over the past few million years, and there is no reason to believe the level is rising or falling abnormally. Oxygen in our atmosphere is largely liberated by photosynthetic cyanobacteria in our oceans. Trees are another good source, and although we have deforested millions of acres, there is little evidence this has had much impact on earth's oxygen level.
Wiki User
∙ 12y agoEarth's atmosphere was probably mostly CO2, SO2, N2, NH3, and CO four billion years ago. Gradually photosynthetic organisms built up the free oxygen, O2, to roughly 20%. Our present atmosphere is mostly nitrogen (N2), at a little over 75%.
Wiki User
∙ 14y agoYes, by a very tiny percentage. This is a result of increased reaction with anthropogenic carbon emissions to form carbon dioxide.
Wiki User
∙ 11y agophotosynthesis
Wiki User
∙ 14y agoNo
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What is the most likely outcome of the use of fossil fuels is not decreased over the next 50 years?
increase in atmospheric CO2 and increase in surface temperature
What is a frequently forgotten source of atmospheric oxygen?
Sources of Atmospheric OxygenVOLCANOES are an often over looked source of atmospheric oxygen. During an eruption, oxygen is often released during chemical reactions caused by the heat of Magma/Lava.Also, algae in the oceans produce the most oxygen in the world, but are usually overlooked in favor of the more glamorous "rain forests". Though the rain forests produce more oxygen per capita, the sheer size and surface area of the world's oceans ensure that there is more primary production.
What is the term for the atmospheric conditions of a place?
Weather is the term for the day-to-day atmospheric conditions of a place. Climate is the term for the general atmospheric conditions of a place over the course of a year.
What two elements make up the majority of earths atmosphere?
Molecular oxygen is a bit over a fifth of the Earth's atmosphere, and molecular nitrogen is a bit under four-fifths of the Earth's atmosphere. There are also small amounts of oxygen and nitrogen in other atmospheric components such as carbon dioxide and ammonia.
Which is a more stable atmospheric condition cool air layered over warm air or warm air layered over cool air?
Cool air layered over warm air is definitely a more stable atmospheric condition.
What is the most likely outcome of the use of fossil fuels is not decreased over the next 50 years?
increase in atmospheric CO2 and increase in surface temperature
What percentage of oxygen do you breath from the air?
100%. All of the oxygen that I breathe comes from the air! The answer that you were probably after, but did not ask, was about the percentage of oxygen in the air that we breathe. The questions may sound similar but they are not the same. The answer is a little over 20%.
What is a frequently forgotten source of atmospheric oxygen?
Sources of Atmospheric OxygenVOLCANOES are an often over looked source of atmospheric oxygen. During an eruption, oxygen is often released during chemical reactions caused by the heat of Magma/Lava.Also, algae in the oceans produce the most oxygen in the world, but are usually overlooked in favor of the more glamorous "rain forests". Though the rain forests produce more oxygen per capita, the sheer size and surface area of the world's oceans ensure that there is more primary production.
What is the term for the atmospheric conditions of a place?
Weather is the term for the day-to-day atmospheric conditions of a place. Climate is the term for the general atmospheric conditions of a place over the course of a year.
Has the number of operations requiring integrated US interagency and NGO and IGO activities significantly decreased dramatically over the past few years?
Yes, they have decreased significantly decreased.
What two elements make up the majority of earths atmosphere?
Molecular oxygen is a bit over a fifth of the Earth's atmosphere, and molecular nitrogen is a bit under four-fifths of the Earth's atmosphere. There are also small amounts of oxygen and nitrogen in other atmospheric components such as carbon dioxide and ammonia.
How to measure oxygen using a lit candle?
Remember the percentage of oxygen in the world today is 21%. Get a lit candle and put it on water. Then put a beaker over the lit candle. The water should rise and fill up to 21% of the candle as there is 21% of oxygen in the world.
What happened to the Byzantine empire's size over time?
decreased
Which is a more stable atmospheric condition cool air layered over warm air or warm air layered over cool air?
Cool air layered over warm air is definitely a more stable atmospheric condition.
Why have the puffin population decreased over the years?
due to climate change
What is 3.6 over 1000 as a percentage?
3.6 over 1000 as a percentage is 0.36%.
What is 3 over 9 as a percentage?
3 over 9 as a percentage is 33.33%.
