13.1 The Earths Atmosphere Flashcards
What is the earths early atmosphere.
One theory suggest that volcanoes released carbon dioxide, water vapour and nitrogen that formed the early atmosphere.
What were the theories as to how life was formed billions of years ago.
Scientists think that life began about 3.4 billion yrs ago when the first simple organisms similar to bacteria appeared.
The word equation and formula equation for “energy from sunlight” is
Carbon dioxide + water ———– glucose + oxygen
6CO2 + 6H2O ————- C6H12O6 + 6o2
What was the positive for plants colonising most of the earth surface.
This made it possible for the first animal forms to evolve. And the atmosphere became richer in oxygen.
How was the earths early atmosphere formed
It was formed by the volcanic activity.
What did volcanic activity consist of
Ir consisted of mainly carbon dioxide. There may also have been nitrogen and water vapour together with traces of methane and ammonia.
As plants spread how did this effect the earths atmosphere.
Levels of oxygen in the atmosphere increased.
How were the mixtures of gases formed?
Scientist suggests that the mixture os gases could have been formed from solar debris ( which are similar to comets) smashing into the earth and vaporising around 500 million years after its formation
Why couldnt living microorganisms not tolerate with high oxygen concentration?
It is because living microorganisms had not evolved without it. They died out as there were fewer places where they could survive.
