The salt concentration (measured as salinity in parts per thousand) is ____ in inland water.

Options

A. 20-30
B. Less than 5
C. 30-35
D. 35-100

Answer

To solve the question regarding the salt concentration (salinity) in inland water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Salinity**: Salinity is a measure of the concentration of salts in water, typically expressed in parts per thousand (ppt).

2. **Identifying Inland Water**: Inland waters include rivers, lakes, and ponds, which are distinct from ocean or sea water.

3. **Comparing Salinity Levels**:
- Ocean or sea water has a high salinity, typically ranging from 30 to 35 parts per thousand (ppt).
- Inland waters, on the other hand, have a significantly lower salinity due to the absence of large amounts of dissolved salts.

4. **Determining Inland Water Salinity**:
- The salinity in inland waters is generally less than 5 parts per thousand (ppt). This low concentration is due to the freshwater nature of these bodies of water.

5. **Conclusion**: Therefore, the salt concentration (salinity) in inland water is less than 5 parts per thousand.

### Final Answer:
The salt concentration (measured as salinity in parts per thousand) is **less than 5** in inland water.