14. Which of the answers correctly identifies a natural source of carbon dioxide? (a) Incomplete combustion of fossil fuels (c) Photosynthesis (b) Volcanic eruptions (d) Chemosynthesis

(b) Volcanic eruptions

Explanation:

Volcanic eruption is naturally occurring event. In Volcanic eruptions many toxic gases are released into the atmosphere such as carbondioxide, carbonmonoxide, hydrogen sulfide, hydrochloric acid and Sulphur dioxide etc. These toxic gases goes to the atmosphere and combine with water vapours forming the water acidic. When this acidic water comes to the earth surface, skin and valuable stones are damaged from it.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.