The Evolution of the Atmosphere
This lesson covers:
- The formation of the early atmosphere by volcanic activity
- How the atmosphere changed with the formation of the oceans
- How living organism made the atmosphere more suitable for life
Roughly how old is the planet Earth?
Around 4.6 billion years old
Around 2.7 billion years old
Around 13.7 billion years old
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Which gas makes up around 80% (78.09% to be exact) of the Earth's atmosphere?
Oxygen
Nitrogen
Carbon dioxide
Argon
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Which gas makes up around 20% (20.95% to be exact) of the Earth's atmosphere?
Nitrogen
Oxygen
Argon
Carbon dioxide
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Which of the gases below contribute less than 1% to the Earths atmosphere?
(Select all that apply)
Nitrogen
Carbon dioxide
Oxygen
Argon
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In the first billion years, the gases that formed Earth's early atmosphere came mainly from which source?
Photosynthesis by plants and algae
Volcanic activity
Burning of fossil fuels
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During the first billion years, which two of the following gases were released from volcanoes?
Carbon dioxide
Oxygen
Water vapour
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Cooling of the Earth
dissolved / cool / warm / sediments / condense / oceans / carbonates
- Around a billion years after it formed, the earth began to . This allowed water vapour to into liquid water and form the .
- When the oceans formed, carbon dioxide in the water, and were precipitated, producing .
- Steps 1 & 2 dramatically reduced the amounts of water vapour and carbon dioxide in the atmosphere.
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Starting 2.7 billion years ago, which process started to increase the amount of oxygen in the atmosphere, and further decreased the amount of carbon dioxide?
Burning of fossil fuels
Volcanic activity
Photosynthesis by plants and algae
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Complete the word equation for photosynthesis:
carbon dioxide + ➔ oxygen +
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As photosynthetic organisms such as plants and algae died, the carbon they contained became trapped in rocks, and fuels.
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