Salinity of seas measured in parts per hundred is :

Options

A. `10-15`
B. 30 - 35
C. 0 - 5
D. 3 - 3.5

Explanation

To determine the salinity of seas measured in parts per hundred, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Salinity**: Salinity refers to the concentration of dissolved salts in water, typically expressed in parts per thousand (ppt) or parts per hundred (%).

2. **Typical Salinity of Seawater**: Seawater generally has a salinity of about 30 to 35 parts per thousand (ppt). This means that for every 1000 grams of seawater, there are approximately 30 to 35 grams of dissolved salts.

3. **Converting Parts per Thousand to Parts per Hundred**: To convert salinity from parts per thousand to parts per hundred, we can use the following relationship:
\[ \text{Salinity (parts per hundred)} = \frac{\text{Salinity (parts per thousand)}}{10} \]
Therefore, if seawater has a salinity of 30 to 35 parts per thousand, we divide these values by 10:
\[ 30 \text{ ppt} = 3 \text{ parts per hundred} \]
\[ 35 \text{ ppt} = 3.5 \text{ parts per hundred} \]

4. **Conclusion**: Thus, the salinity of seawater is approximately 3 to 3.5 parts per hundred.

5. **Final Answer**: The correct option for the salinity of seas measured in parts per hundred is **3 to 3.5**.