Which of the following is a natural source for the release of carbon-dioxide in the atmosphere?

Question

Question 2 options:

Volcanoes

Burning fossil fuels

Photosynthesis by plants

Both A and B

Answer 1

Both A and B are natural sources for the release of carbon dioxide in the atmosphere. Volcanoes release carbon dioxide during volcanic eruptions, while the burning of fossil fuels also releases carbon dioxide when these fuels are burned for energy.