Physics
Air moves from the region where the air ________

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

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Physics
RADAR is used for:

detecting and locating the position of objects such as Aeroplanes.
receiving a signals in a radio receiver.
locating submerged submarines.
locating geostationary satellites.

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