Consider the following:
1. Pyroclastic debris
2. Ash and dust
3. Nitrogen compounds
4. Sulphur compounds

How many of the above are products of volcanic eruptions?

Correct Option: (d) All four

All four listed items are products of volcanic eruptions. Volcanic eruptions eject solid materials including pyroclastic debris, volcanic ash, and dust, alongside gases such as nitrogen compounds, sulphur compounds, carbon dioxide, and water vapour.