Radon is <span>not a source of air pollution related to human activities</span>
Answer:
d) They're studying something for which they cant do an experiment
Explanation:
B. released, forming bonds usually releases energy.
The answer is evaporation<span>.Evaporation is the vaporization of the liquid from its surface into gaseous phase, without boiling the liquid. When all the liquid has passed to gaseous phase the salt dissolved in the salt water will remain as solid crystals.</span><span />