9. wind power creates pollution. water air soil noise

Noise Pollution is your answer.

Explanation:

Wind turbines are a better alternative to using non-renewable resources.They produce little pollution (Noise pollution and Visual pollution), But they are a threat to wild life and not to mention, really expensive.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high