Why is thermite process used for joining railway tracks or cracked machine parts?

Explanation

### Step-by-Step Solution:

1. **Understanding the Thermite Process**:
The thermite process is a chemical reaction that involves the reduction of metal oxides using aluminum powder. This reaction is highly exothermic, meaning it releases a significant amount of heat.

2. **Chemical Reaction**:
The primary reaction in the thermite process can be represented as:
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