Which was thought to be the most abundant gas in the Earth's early atmosphere?
  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • Argon
Carbon dioxide entered the early atmosphere when it was released from...
  • the oceans
  • the volcanoes
  • comets from space
  • water in the atmosphere
The percentage of water on the planet did NOT increase due to...
  • volcanoes
  • comets
  • condensation from the atmosphere
  • plants
Which of the following gasses is thought NOT to have been present in the early atmosphere?
  • Carbon dioxide
  • Water vapor
  • Oxygen
  • Methane
Oxygen started to appear on Earth due to what organisms?
  • Blue-green algae
  • Plants
  • Humans
  • Viruses
What process produces oxygen as a waste product?
  • Respiration
  • Photosynthesis
  • Decomposition
  • Combustion
Which of the following is NOT a reason for the small percentage of carbon dioxide in the Earth's atmosphere today?
  • Some carbon dioxide has dissolved in the oceans
  • Carbon dioxide has been used to form sedimentary rocks
  • Some carbon dioxide has been locked up in fossil fuels
  • There has always only been a small amount of carbon dioxide in the atmosphere
At one time in the Earth's formation, some of the surface iron was oxidized. What gas in the atmosphere could NOT have caused this change?
  • Nitrogen
  • Carbon dioxide
  • Oxygen
  • Water vapor
Which of the following developments is NOT as a result of concerns about carbon dioxide levels and global warming?
  • Use of ethanol as a fuel in cars
  • Use of diesel oil instead of gasoline in cars
  • Use of vegetable oils as a fuel in cars
  • Development of electric cars
The change in carbon dioxide concentration in the last 50 years is thought to be a result of...
  • increased volcanic activity
  • increase in the use of fossil fuels
  • variation in the sun's energy output
  • increase in ocean temperatures
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