Physics
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

Have its shape changed
Remain unaffected
Increase
Decrease

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Physics
Air moves from the region where the air ________

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