How carbon dioxide decreased


  • Algae and plants decreased the percentage of carbon dioxide in the atmosphere by photosynthesis.

Carbon dioxide was also decreased by the formation of sedimentary rocks and fossil fuels that contain carbon.

  • Students should be able to:
  • describe the main changes in the atmosphere over time and some of the likely causes of these changes
  • describe and explain the formation of deposits of limestone, coal, crude oil and natural gas.

WS 1.2Use a variety of models such as representational, spatial, descriptive, computational and mathematical to solve problems, make predictions and to develop scientific explanations and understanding of familiar and unfamiliar facts.

WS 4.1 Use scientific vocabulary, terminology and definitions.