Sea water is saltier than rain water because

Options

A. sea animals are salt producing
B. sea beds have salt producing mines
C. the air around sea is saltish
D. rivers wash away salts from earth and pour them into sea

Explanation

**Step-by-Step Solution:**

1. **Understanding the Composition of Sea Water and Rain Water:**
- Sea water contains a high concentration of dissolved salts, primarily sodium chloride (NaCl), along with other minerals. In contrast, rain water is generally fresh and contains very low levels of dissolved salts.

2. **Source of Salts in Sea Water:**
- The salts in sea water primarily come from the weathering of rocks on land. Rivers and streams erode these rocks and carry the dissolved salts and minerals into the oceans.

3. **Evaporation Process:**
- When water from the ocean evaporates to form clouds, only the water molecules transition into vapor. Salts and other impurities do not evaporate; they remain in the ocean. This means that the water vapor that forms clouds is essentially salt-free.

4. **Formation of Rain Water:**
- As the water vapor condenses to form clouds and eventually falls as rain, it does not carry the salts from the ocean. Therefore, rain water is much less salty compared to sea water.

5. **Conclusion:**
- The reason sea water is saltier than rain water is that rivers wash away salts from the earth and transport them into the sea, while the evaporation process leaves these salts behind in the ocean.

**Final Answer:**
Sea water is saltier than rain water because rivers wash away salt from the earth and pour it into the sea.

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