Studies show that volcanoes emit about 130 to 380 million metric tons of carbon dioxide (CO₂) per year. Which question can best help scientists determine if either volcanic eruptions or human activities are the main cause of the increasing CO₂ levels shown in Graph 2? A How many active volcanoes are there on Earth? 1 B Is there more carbon in limestone and rock deposits or in coal, oil, and gas deposits? Does the rate of combustion for fossil fuels occur faster than a volcanic eruption? faster t How has the emission of greenhouse gases from human activities changed over time?

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