Which of the following is released by volcanic eruption and is a

Correct answer: C) Sulfur.
1. Volcanic eruptions can release large amounts of sulfur compounds, such as sulfur dioxide (SO2) and hydrogen sulfide (H2S), into the atmosphere.
2. Sulfur is a necessary nutrient for living things, as it is a component of certain amino acids, proteins, and other biomolecules. It is an essential element for plant and animal growth and development.
3. However, when sulfur compounds released by volcanic eruptions or other sources (such as the burning of fossil fuels) react with water in the atmosphere, they can form sulfuric acid, leading to the phenomenon of acid rain.
Acid rain can have negative impacts on ecosystems, such as acidifying lakes and streams, damaging vegetation, and corroding buildings and infrastructure.

The other options are not the correct answer:
A) Calcium is not a major component released by volcanic eruptions, and it does not lead to acid rain.
B) Potassium is an essential nutrient, but it is not a significant contributor to acid rain formation.
D) Nitrogen is an essential nutrient, but it is not the primary element released by volcanic eruptions that can lead to acid rain.