Answer the question based on the extraction of aluminium from alumina by Hall Heroult's Process :
What is sprinkled on top of the electrolyte ?

Explanation

To answer the question regarding what is sprinkled on top of the electrolyte in the Hall-Heroult process for extracting aluminum from alumina, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Hall-Heroult Process**:
- The Hall-Heroult process is an electrolytic method used to extract aluminum from alumina (Al2O3). This process involves the electrolysis of molten alumina dissolved in molten cryolite (Na3AlF6).

2. **Identifying the Electrolyte**:
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