Correct the following statements by changing the underlined part of the sentence :
Parke's process is used in the extraction of `ul("copper")`.

Explanation

To correct the statement "Parke's process is used in the extraction of copper," we need to identify the correct metal that Parke's process is actually used to extract.

### Step-by-Step Solution:

1. **Identify the Incorrect Part of the Statement**: The statement mentions "copper" as the metal extracted by Parke's process.

2. **Determine the Correct Metal**: Parke's process is not used for copper; it is actually used for the extraction of lead.

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