Carbon Monoxide – CO: poisonous
 Carbon Dioxide – CO₂: greenhouse gas,
poisonous at high concentrations

1. Fossil Fuels
› Ex: Coal, oil, gasoline, natural gas, propane
2. Graphite
› Highest grade of coal
› Conducts electricity
› Used in pencils (lead)
3. Diamonds
› Formed from coal that is under high pressure
and heat
4. Wood
Atmosphere
 Plants
 Animals
 Fossil Fuels
 Rock
 Soil
 Wood


Ocean: called a carbon sink because it
takes up excess CO₂ from the atmosphere
0.04% of the Atmosphere
 Greenhouse gas
 Byproduct of respiration
 Needed for photosynthesis
 Emitted as fossil fuels are burned
 Harmful at high concentrations
 Solid form is dry ice


CO₂ concentrations fluctuate over time
› Levels are higher than they were 1000 years ago
Animal Respiration
 Burning fossil fuels

› Turning on lights, driving cars,
› Factories, burning coal
Volcanoes
 Earthquakes
 Forest fires
 Oceans

Photosynthesis
 Oceans: carbon sink
 Decaying organisms
