Chemistry

The Early Atmosphere
1. The earths First atmosphere was formed by gases produced mostly from volcanoes
  1. The earth started of very hot with no oceans, but as the earth cooled down the water vapour condensed, forming a liquid water. This liquid water became the oeans
    1. Gases produced by volcanoes today would give some idea of the types of gasses that would have been produed by volcanoes in the past.
A Changing Atmosphere
1. Early Earth - Atmosphere was mainly made of carbon dioxide with little to no oxygen. Todays atmosphere = less than 1% Carbon dioxide and 21% Oxygen
  1. This means that;
    1. Carbon dioxide has been removed from the atmosphere
    2. Oxygen has been added t the atmosphere
2. Adding Oxygen
  1. First organisms on earth did not use or produce oxygen. About 1 billion years ago life evolved in the ocean that used photosynthesis.
    1. Photosynthesis = Carbon Dioxide and water are turned into glucose and oxygen, This reaction requires light energy which is absorbed by chlorophyll
The Atmosphere Today

Resource summary

	Created by charley pullin over 9 years ago