Please answer the following question: Answer the following question given this paragraph: Carbon from decaying organisms enters the ground. Some carbon is stored in the soil. Some carbon may be stored underground for millions of years. This will form fossil fuels. When volcanoes erupt, carbon from the mantle is released as carbon dioxide into the air. Producers take in the carbon dioxide to make food. Then the cycle repeats. Q: When volcanoes erupt, what from the mantle is released as carbon dioxide into the air? Choices: - lava - hydrogen - vapor - carbon A:
A:
carbon