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Chemistry

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Chemistry
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  • 4.55 BILLION YEARS AGO
  • After the big bang the earth was a very hot ball of fire and volcanoes erupted frequently releasing carbon dioxide and water vapor into the air
  • After the earth's surface cooled down, the water vapor condensed and rain fell creating huge buckets of water that we now call oceans
  • The earth's atmosphere was made up of mostly carbon dioxide. Oxygen was not yet created, all animals were aquatic and respired anaerobically
  • Algae, an aquatic plant, began to photosynthesize; it took in carbon dioxide and released oxygen
  • Due to the large amounts of carbon dioxide, algae could photosynthesize often and therefore increase in amount. The increase in algae caused a huge decrease in carbon dioxide concentrations and increasing oxygen. Animals evolved and began to live depending on oxygen and respire aerobically
  • After the atmosphere mainly consisted of Oxygen, people began polluting the air and releasing a large amount of carbon dioxide leading the amounts of carbon dioxide to increase in the atmosphere but still at a very small percentage
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