What is released by an erupting volcano? 

A)  oil 
B)  carbon dioxide 
C)  ozone 
D)  organic matter

Erupting Volcano

A geological event where molten rock, ash, and gases escape from a crack in the Earth's surface.

Carbon Dioxide

A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in the air and is absorbed by plants in photosynthesis.