Question: how was the sky made

Sam Horrell answered on 18 Jun 2013:

Between The Earth and space we have the trophosphere, stratosphere, mesosphere, thermosphere and exosphere, with the O-zone layer somewhere aroud 20-30km high in the stratosphere. This is known as the atmosphere and I guess these are what effecitively make up the sky.

The atmosphere was made very gradually by various bacteria and algae which colnised the Earth in different times throughout its history. As one organism thrived it would use up the chemicals in the environment and change it into something new. Eventually a new organism would come along and outcompete the previous organism by using the chemicals the old organisms produced. This cycle kepts repeating until the environemnt stabilised into what we have now. But we’re doing a pretty good job of messing up the environment those organisms worked so hard to make.