Atmospheric Change
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What life forms where there 4.6 billion years ago?
None
What life forms where there 4 billion years ago?
Simple ones, ie archea
What life forms where there 3 billion years ago?
Blue green algae + Cyanobacteria
What happened to simple life forms 2 billion years ago?
Mass extinction (due to pollution) of archea
What happened to life forms 1 billion years ago?
Complex life forms (animals) evolved
What happened to life forms in the last 200million years
Modern life forms
What was happening to the Planet: 4.6 billion years ago?
Volcanoes and meteorite impacts
What was happening to the Planet: 4 billion years ago?
Temp cools, ocean forms, hydrogen lost to space, sulfur oxides dissolve
What was happening to the Planet: 3 billion years ago?
Photosynthesis starts producing oxygen,
What was happening to the Planet: 2 billion years ago?
Thick beds of iron oxide rocks, carbon dioxide removed
What was happening to the Planet: 1 billion years ago?
Excess oxygen forms ozone layer
What was happening to the Planet: last 200 million years?
Stable atmosphere
Components in the ‘atmosphere’ 4.6 ba?
Carbon dioxide, water vapour, ammonia, sulfur oxides, hydrogen, methane, argon
Components in the atmosphere 3 ba?
Carbon dioxide, nitrogen, argon
Components in the modern day atmosphere?
Oxygen, nitrogen, carbon dioxide, nitrogen