Q: When volcanoes erupt, what from the mantle is released as carbon dioxide into the air?


Read this paragraph and choose the correct option from the provided answers:

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.

 Choices:

- lava

- hydrogen

- vapor

- carbon


A:
carbon