Why is water of oceans salty?

Explanation

### Step-by-Step Solution:

1. **Understanding Ocean Salinity**: The salinity of ocean water refers to the concentration of salts dissolved in it. The primary reason for the saltiness of ocean water is the presence of various dissolved ions.

2. **Runoff from Land**:
- When it rains, water flows over the land and interacts with rocks and soil.
- This process is known as runoff, where water erodes rocks and minerals, releasing dissolved ions into the water.
- The major source of these dissolved ions is the rocks surrounding the oceans, which contain various minerals.
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