Which type of smoke control system or method uses mechanical ventilation along with the properties of smoke to collect smoke at the highest point in a large space?

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

compass can be used day and night, cloudy or sunny

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