Q: What is released into the atmosphere when fossil fuels are burned?


Read this paragraph and choose the correct option from the provided answers:

Major reservoirs of carbon include sedimentary rocks, fossil fuels, and the ocean. Sediments from dead organisms may form carbon-containing sedimentary rocks. Alternatively, the sediments may form carbon-rich fossil fuels, which include oil, natural gas, and coal. Carbon can be stored in these reservoirs for millions of years. However, if fossil fuels are extracted and burned, the stored carbon enters the atmosphere as carbon dioxide. Natural processes, such as volcanic eruptions, can also release underground carbon from rocks into the atmosphere.

 Choices:

- hydrogen dioxide

- ferris oxide

- hydrogen monoxide

- carbon dioxide


A:
carbon dioxide