Answer:
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<span>The air that is found in soil is extremely different from the air that is found in the atmosphere. Why, you ask? Well, it's because the air that are in soils are not exactly exposed to moving air currents, thus the air that is found in soils are more moist and humid.
Good luck with your studies, I hope this helps~!</span>
Mondays and Thursdays is only 2 days a week. So 2.15x2 is 4.3 hours a week. 4.3x3= 12.9 hours every 3 weeks or 12 hours and 54 minutes
It should be installed by a electrician
