The natural cycle that would have a direct effect of burning of fossil fuels would be the carbon cycle. <span>The </span>carbon cycle<span> is the biogeochemical </span>cycle<span> by which </span>carbon<span> is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Hope this answers the question.</span>
I think the answer is 80 because if he makes 20 loaves of bread each morning, and 10 more every half an hour for three hours ( 20 + 60 = 80) the answer should be 80. Correct me if I'm wrong please, Thank You!