Question

4.	How can scientists distinguish among different sources of CO2 in the atmosphere?
	Different possible sources of CO2 cannot be easily distinguished. The amount of different carbon isotopes in the CO2 differs based on the source. The amount of possible CO2 differs between the different sources. The amount of different oxygen isotopes in the CO2 differs based on the source.
6.	Which of the answer choices are reservoirs of carbon? Select all that apply.
	the atmosphere burning wood oceans organisms soil

Answer 1

6. the best carbon reservoirs include the ocean, the atmosphere, soil, the atmosphere and the burning wood as it emits carbon. among these the most carbon reservoirs are found in the ocean which is about 36 billion tons of carbon.

4. There are three isotopes of carbon atoms,the only chemical difference between them is that they have slightly different masses. The heaviest is carbon-14 , followed by carbon-13 (13C), and the lightest, most common carbon-12 (12C). different carbon reservoirs have different isotropic fingerprints. By examining the isotopic mixture in the atmosphere, and knowing the isotopic fingerprint of each reservoir, atmospheric scientists can determine how much carbon dioxide is coming and going from each reservoir, making isotopes an ideal tracer of sources and sinks of carbon dioxide.