Question

Why gold and silver found in rocks are pure metals? *

1. They are very reactive and form a protective coating around themselves
2. They do not react with anything
3. They only react with air, and air cannot get through the rock to them
4. They only react with water and water cannot get through the rock to them

Answer 1

Answer:

3. They only react with air, and air cannot get through the rock to them

Explanation:

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