Fill in the Blanks Carbon intro "game"Online version Used to intro carbon cycle by Wally Mason 1 Carbon Carbon Carbon Carbon Dioxide Limestone Oxygen Carbon Dioxide Carbon Natural Carbon Coal Dioxide Carbo Carbon Calcium gas Hydrogen Dioxide Oxygen Petroleum Scavenger Hunt Use google to search for these answers . . . 1 . The top 2 most abundant elements in living things are . . . . , 2 . Which gas do animals breathe out during respiration ? - 3 . Which gas do plants take in during photosynthesis ? ( - ) 4 . Where do plants get their mass ? 5 . Which gas controls temperature on earth ? - 6 . What is the most abundant sedimentary rock on earth ? 7 . What elements are found in limestone ? , , 8 . What energy sources are currently used the most ? , - , 9 . What are the two main elements found in fossil fuels ? , 10 . What gas is released when fossil fuels are burned ? - 11 . Which element is present in questions 1 - 10 :