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What was the composition of earth's atmosphere 4600 million years ago?
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What does our atmosphere do that makes conditions on Earth suitable for life?
You have it wrong way round, the atmosphere of Earth was created by the life on Earth. 4000 million years ago the atmosphere had no oxygen and was full of CO2, Nitrogen and Methane. However life came into existence in this atmosphere and over time has altered the atmosphere to what we have today. Therefore the composition of the atmosphere would not appear to be critical to life.
What is a period of earths history that lasted 245 to 208 million years ago?
The Triassic
Has earths total water supply decrease greatly over the past million years?
yes
How might burning fossil fuels affect the composition of gases in the atmosphere?
Burning of fossil fuels (coal, oil and natural gas) in industry, transport and the generation of electricity releases carbon dioxide (and other gases). These change the composition of gases in the atmosphere. The present levels of carbon dioxide have increased from 280 ppm (parts per million) one hundred years ago to the present 400 ppm.
How many million of years ago did Earth's atmosphere attain the oxygen levels it has today?
1000 millions years ago.
What does our atmosphere do that makes conditions on Earth suitable for life?
You have it wrong way round, the atmosphere of Earth was created by the life on Earth. 4000 million years ago the atmosphere had no oxygen and was full of CO2, Nitrogen and Methane. However life came into existence in this atmosphere and over time has altered the atmosphere to what we have today. Therefore the composition of the atmosphere would not appear to be critical to life.
How has the earths atmosphere changed?
The earths atmosphere has significantly altered over the years. The process of the earth's atmosphere was recognized and evolved 2.7 billion years ago, forming the nitrogen-oxygen atmosphere that exists today. This change enabled the formation and beginning of the ozone layer (which along with magnetic fields) block solar radiation.
What is the earths revolution earth years?
The sun revolves around the galactic center in about 220 million years, give or take 20 million years or so.
When was water invinted?
Water was not invented by a person but happened naturally as the Earth cooled after being formed 4.54 billion years ago. After 10 or 20 million years, the lava that covered the earths surface began to cool and the atmosphere began to form. Eventually, moisture built up in the atmosphere and came down as rain.
What is a period of earths history that lasted 245 to 208 million years ago?
The Triassic
How long has oxygen been fully present in the atmosphere?
500 million years
What is a gas that was probably abundant in earths atmosphere 3.6 billion years ago and is still abundant today?
Oxygen
Has earths total water supply decrease greatly over the past million years?
yes
How might burning fossil fuels affect the composition of gases in the atmosphere?
Burning of fossil fuels (coal, oil and natural gas) in industry, transport and the generation of electricity releases carbon dioxide (and other gases). These change the composition of gases in the atmosphere. The present levels of carbon dioxide have increased from 280 ppm (parts per million) one hundred years ago to the present 400 ppm.
How many million of years ago did Earth's atmosphere attain the oxygen levels it has today?
1000 millions years ago.
What 3 gases made up the earths atmosphere a lot of years ago?
carbon dioxide, sulphur dioxide and still nitrogen
How much time is 4 percent of the time represented by earths oldest known rocks?
1 million years
