जॉइन Examsbookउत्तर : 2. "Oxygen"
Rust forms when _____ reacts with chemicals in rocks.5
प्र: Rust forms when _____ reacts with chemicals in rocks.
- 1Waterfalse
- 2Oxygentrue
- 3Nitrogenfalse
- 4Carbondioxidefalse
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उत्तर : 2. "Oxygen"
व्याख्या :
Answer: B) Oxygen Explanation: Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.

