The process by which ligher earthly particles are made free from heavier particles by washing with water is called

Options

A. gravity separation method
B. Levigation
C. Hydraulic washing
D. Leaching

Answer

To solve the question, we need to identify the process by which lighter earthly particles are separated from heavier particles using water.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about a specific process that separates lighter particles from heavier ones by washing with water.

2. **Identifying the Options**: The options provided are:
- A) Gravity separation method
- B) Navigation method
- C) Hydraulic washing
- D) Leaching

3. **Analyzing the Options**:
- **Gravity Separation Method**: This method involves separating particles based on their density differences. Lighter particles can be washed away with water, leaving the heavier particles behind.
- **Navigation Method**: This term is not commonly used in the context of metallurgy and does not relate to the separation of particles.
- **Hydraulic Washing**: This is another term for the process where water is used to wash away lighter particles, allowing heavier particles to settle.
- **Leaching**: This process involves using a solvent to dissolve specific minerals, and it does not primarily use water to separate particles based on density.

4. **Conclusion**: Both the gravity separation method and hydraulic washing refer to the same process of using water to separate lighter particles from heavier ones. However, since the question specifically asks for the process involving washing with water, the most appropriate answer is **Hydraulic Washing**.

5. **Final Answer**: The process by which lighter earthly particles are made free from heavier particles by washing with water is called **Hydraulic Washing**.