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• At the beginning of the earth’s life, the atmosphere had
• mostly water vapor|80 % of water vapour|2 % of dinitrogen| 17 % of carbon dioxide
• 78 % of dinitrogen
• 20 % of dioxygen
• 0.7 % of carbon dioxide
• a lot of dioxygen
• a smaller pressure than today
• a lot of CH4 (methane)
• traces of nitrous oxide (N2O)
• a red colour
• Nowadays atmosphere
• has the same amount of dinitrogen than before| is mainly made up of dinitrogen | lost most of its water vapor
• has more carbon dioxide than dioxygen
• has lost its dinitrogen
• has more dinitrogen than before
• has less dioxygen than the Early Atmosphere
• has more carbon dioxide than the Early Atmosphere
• Most of the water vapor disappeared from the atmosphere
• because the Earth has cooled| because the temperature decreased from 440 to 288 K| because the temperature has decreased by 447 °C| because water vapor has become liquid water
• because the pressure has decreased by 8200 kPa
• because the pressure has increased
• because the water vapor has escaped from the atmosphere
• because the temperature of the Earth has risen by 100 °C
• because a kid ate all the clouds
• What do we know about the oldest life forms we found ?
• They are stromatolites fossils | They lived 3.5 billion years ago | They lived in warm and shallow seas
• We found them in warm and shallow seas
• They lived 3.5 million years ago
• They were the size of an elephant
• They lived in deep oceans
• They lived on the continents
• They looked like small worms
• The metabolism of the first life form known
• is photosynthesis |creates dioxygen | uses carbon dioxide |is the same metabolism as that of plants
• is respiration
• creates carbon dioxide
• decreased the water in the atmosphere
• increased dioxygen in the air 3.5 Giga years ago
• can produce 2.21 Gigawatts
• Dioxygen began to increase in the atmosphere
• 2.2 billon years ago | when BIF were not formed anymore | when most of the iron of the ocean was oxidised
• when stromatolites began to create dioxygen
• when all the red paleosols were oxidised
• when it started to increase in the ocean
• 3.5 billion years ago
• when life forms stopped breathing
• Ozone
• is created thanks to UV radiations | is mostly created in the stratosphere | is due to the collision of one molecule of O2 and an O atom.
• is created thanks to X-ray radiations
• is mostly created in the troposphere
• forms a big layer at an altitude of 10 km
• is made of oxygen and carbon
• is a very well-known Moldavian rap group
• The ozone layer
• protects DNA from mutations | was necessary for the colonization of life on the continents | captures harmful UV rays from the sun | absorbs mostly UVB radiations
• is dangerous for our DNA
• prevents life on Earth
• absorbs mostly UVA radiations
• increased the greenhouse effect
• is the worst greenhouse gas
• In the chronology of events, what happened before the release of oxygen in the water
• appearance of aquatic life | Earth cooling | formation of the oceans
• continental photosynthesis
• formation of the ozone layer
• appearance of continental plants
• oxidation of aquatic iron
• the birth of Godzilla
• In the chronology of events, what happened right after the release of oxygen in the water
• oxidation of aquatic iron
• appearance of aquatic life
• continental photosynthesis
• formation of the ozone layer
• appearance of continental plants
• release of oxygen into the atmosphere
• the appearance of two kraken

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