Physics
Air moves from the region where the air ________

Pressure is high to the region where the pressure is low
Humidity is low to the region where the humidity is high
Humidity is high to the region where the humidity is low
Pressure is low to the region where the pressure is high

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Physics
A standing wave occurs when

The amplitude of a wave exceeds its wavelength
Two waves overlap
A wave reflects upon itself
The speed of the wave is zero or near zero

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