Volcanic eruptions let out large quantities of

Options

A. Harmful dust and sulfurous gases
B. Harmful dust and nitrous gases
C. Harmful dust and carbonous gases
D. Harmful dust and phosphorous gases

Answer

### Step-by-Step Text Solution:

1. **Understanding Volcanic Eruptions**: Volcanic eruptions are geological events where magma from beneath the Earth's crust is expelled to the surface, often resulting in the release of various gases and ash.

2. **Components Released During Eruptions**: When a volcano erupts, it releases a variety of substances. The most notable among these are gases and ash. The gases can include water vapor, carbon dioxide, sulfur dioxide, and other harmful gases.

3. **Identifying Harmful Substances**: Among the gases released, sulfur dioxide is particularly harmful and is known to contribute to acid rain, which can have detrimental effects on the environment and human health. Other gases like carbon monoxide can also be harmful.

4. **Analyzing the Options**: The question provides four options regarding the substances released during volcanic eruptions:
- A) Harmful dust and sulfurous gases
- B) Harmful dust and nitrous gases
- C) Harmful dust and carbonous gases
- D) Harmful dust and phosphorus gases

5. **Selecting the Correct Answer**: Based on the understanding that volcanic eruptions primarily release harmful dust (ash) and significant quantities of sulfur dioxide (a sulfurous gas), the correct answer is:
- **A) Harmful dust and sulfurous gases**.