Radon is <span>not a source of air pollution related to human activities</span>
Answer:
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Explanation:
Answer:
Because you can physically see the object melting when it comes to the melting point. The objects texture, color, temperature, shape, and state of matter (solid, liquid, gas) are possibly changing.
Answer:
This process naturally occurs in the environment, where it is carried out by specialized bacteria.
Explanation: