Many different processes, both natural and human-caused, can release carbon dioxide into the atmosphere. Which of the following processes can occur naturally and adds carbon dioxide to the atmosphere?

carbon dioxide is added to the atmosphere naturally when organisms respire or decompose,  

Explanation:

Plants burning in a forest fire

Explanation:

i got it from study island :D

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

answer; i do believe the correct answer is (river); /// good luck