Air and Rock Essay

Air and Rock Essay

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Air and Rock


Composition of atmosphere:

* 78% nitrogen

* 21% oxygen

* 0.04% CO2

* 1% Noble gases (mainly argon)

Atmosphere wasn’t always like this, here’s how the first 4.5 billion
years have gone:


Phase 1 (first billion years) – Volcanoes gave out steam, CO2, NH3 and
CH4
----------------------------------------------------------------------

* earth’s surface molten, any atmosphere boiled away.

* Cooled and thin crust formed but volcanoes kept erupting.

* Belched out CO2

* Also steam, ammonia and methane

* Early atmosphere mostly Co2, carbon monoxide and water vapour

* Virtually no oxygen

* Water vapour condensed to form oceans.


Phase 2 (next 2 billion years) – Green plants evolved and produced
oxygen
------------------------------------------------------------------

* Green plants evolved

* Plants happy in CO2 atmosphere

* A lot of Co2 dissolved in oceans

* Green plants removed Co2 and produced O2 by photosynthe...

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