What is the water-bearing layer of the earth known as?

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term used to describe the layer of the earth that holds water.

2. **Identifying the Term**: The layer of the earth that is known for containing water is called an "aquifer."

3. **Characteristics of an Aquifer**:
- An aquifer is typically located underground.
- It is primarily composed of rock, which can include layers of silt and sand.
- The structure of an aquifer allows it to store water effectively.

4. **Importance of Aquifers**:
- Aquifers are significant because they provide clean and purified water for various uses.
- The water in aquifers is often filtered through the rock layers, which helps in maintaining its cleanliness.

5. **Conclusion**: Therefore, the water-bearing layer of the earth is known as an "aquifer."

---