When the bottom of a cloud and the ground below become too heavily charged, electrons from the bottom of the cloud jump to the Earth in a huge

Options

A. Sparks
B. Lightning
C. Air current
D. Electric discharge

Answer

### Step-by-Step Solution:

1. **Understanding the Phenomenon**: The question describes a situation where the bottom of a cloud and the ground below become heavily charged. This leads to a movement of electrons from the cloud to the Earth.

2. **Identifying the Process**: This movement of electrons is known as an **electric discharge**. It occurs when there is a significant difference in electric charge between two objects, in this case, the cloud and the Earth.

3. **Reason for Electron Movement**: Electrons are negatively charged particles. They move from the negatively charged bottom of the cloud to the positively charged Earth. This movement occurs because opposite charges attract each other.

4. **Naming the Phenomenon**: The specific event of electrons jumping from the cloud to the Earth can be referred to as **lightning**. Lightning is a visible discharge of electricity that occurs during a storm.

5. **Conclusion**: Therefore, the correct answer to the question is that this phenomenon is called **electric discharge**, and specifically, it can be identified as **lightning**.

### Final Answer:
The phenomenon described is known as **electric discharge**, specifically in the form of **lightning**.

---