Decrease of Carbon Dioxide Levels

• What has happened as plants and algae have evolved?

  The level of carbon dioxide has decreased , as plants use it during photosynthesis
• One reason the amount of carbon dioxide in the atmosphere has decreased is due to photosynthesis. State another reason

  Carbon becomes locked up in sedimentary rocks (like limestone) and fossil fuels (like coal , crude oil and natural gas)
• Describe the properties of limestone

  It contains calcium carbonate , and can be formed from the shells and skeletons of sea creatures
• Describe the properties of coal?

  It is a sedimentary rock formed from plant deposits that were buried and compressed over millions of years
• The level of carbon dioxide in the atmosphere has been reduced by the reaction of what 2 things?

  The reaction between carbon dioxide and sea water
• The reaction between carbon dioxide and sea water produces what 2 things ?

  Insoluble carbonates that are deposited as sediment and soluble hydrogen carbonates
• What is the negative of too much carbon dioxide dissolving in the ocean?

  It harms marine life , such as coral reefs