January 17, 2019
Broken Relationship

A Broken Relationship

The planet we live in is the third planet from the sun. Our planet is 5 billion years old; we have had three atmospheres during this time. The first atmosphere was helium and hydrogen. This did not last long, because the planet was too hot. Volcanic eruptions led to emissions of steam and carbon dioxide. This was our second atmosphere. Later the water vapor condensed to form the oceans that cover most of the planet we have now. About 3 billion years ago, two different types of bacteria started to form, releasing oxygen and nitrogen. This became our third atmosphere. […]