Sand settles down in water.

Explanation

To determine whether the statement "Sand settles down in water" is true or false, we can analyze the properties of sand and water.

### Step-by-Step Solution:

1. **Understanding Density**:
- Density is a measure of how much mass is contained in a given volume. If a substance has a higher density than water, it will sink; if it has a lower density, it will float.

2. **Comparing Densities**:
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