Carbon is a common component of
The geologic portion of the carbon cycle operates on a scale of days to months.
Photosynthesis is the process by which plants
Respiration is the process by which ____________ is consumed and _______________ is produced.
Regular, annual fluctuations in atmospheric carbon dioxide concentrations occur because
How does the concentration of carbon dioxide in the atmosphere affect climate?
According to most scientists, activities like fossil fuel burning and deforestation have affected the global carbon cycle.
Which of the following processes does NOT add carbon to the atmosphere?
Although direct measurements of atmospheric carbon dioxide have only been taken consistently since the 1950s, scientists have been able to retrieve data from the past 500,000 years. They have been able to do this by looking at
A net carbon source is a carbon pool which takes in more carbon than it releases.